Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
THE RADIO PLANET Ralph Milne Farley Cabot or the Prince Yuri over the new continent. “It’s too bad that Myles Cabot can’t see this!” I exclaimed, as my eye fell on the following item: SIGNALS FROM MARS FAIL TO REACH HARVARD Cambridge, Massachusetts, Wednesday. The Harvard College Radio Station has for several weeks been in receipt of fragmentary signals of extraordinarily long wave-length, Professor Hammond announced yesterday. So far as it has been possible to test the direction of the source of these waves, it appears that the direction has a twenty-four hour cycle, thus indicating that the origin of these waves is some point outside the earth. The university authorities will express no opinion as to whether or not these messages come from Mars. Myles, alone of all the radio engineers of my acquaintance, was competent to surmount these difficulties, and thus enable the Cambridge savants to receive with clearness the message from another planet. 6 Twelve months ago he would have been available, for he was then quietly visiting at my farm, after five earth-years spent on the planet Venus, where, by the aid of radio, he had led the Cupians to victory over their oppressors, a human-brained race of gigantic black ants. He had driven Formia. Their testimony was brief. making an argument through the antennae of another.” to occupy the throne of Cupia. While at my farm Cabot had rigged up a huge radio set and a matter-transmitting apparatus, with which he had Whereupon the queen and the council went into executive session. Their remarks were not intended for the eyes won and wed the Princess Lilla, who had borne him a son (presumably) shot himself back to Poros on the night of the big October storm which had wrecked his installation. in and held up one paw. Cabot’s interpreter, not deeming this a part of the executive session, obligingly translated the The messenger: “Yuri lives and reigns over Cupia. It is his command that Cabot die.” Barth: “It is the radio. Know then, O Queen, and ye, members of the council, that when we fled across the boiling IV with the heart of a Formian, he brought with him one of those powerful radio sets invented by the beast who is our prisoner here to-day. THE COUP D’ETAT and he has been in constant communication with these ever “Speaking.” on my farm. “Professor Hammond thinks that he is getting Mars on the air,” the voice continued. opened. which it had received that day. “Well,” he said, “in view of the fact that I am one of the few people among your readers who take your radio stories seriously, I think that Hammond is getting Venus. 19 Can you run up here and help me try and convince him?” As a result of our conference, a small committee of engineers returned with me to Edgartown that evening for the purpose of trying to repair the wrecked radio set which Myles Cabot had left on my farm. They utterly failed to comprehend the matter-transmitting apparatus, and so—after the fallen tower had been reerected situation. If it had still been in vogue among the Formians to be known by numbers rather than names, and to have many a Formian would have “got the number” of many aid of some old blue prints of Cabot’s which Mrs. Farley, like Swiss Family Robinson’s wife, produced from somewhere. I was the first to try the earphones, and was rewarded by a faint “bzt-bzt” like the song of a north woods blackfly. In conventional radioese, I repeated the sounds to the Harvard group: “Dah-dit-dah-dit dah-dah-dit-dah. Dah-dit-dah-dit dah-dah-dah.” 8 the same message, and again I repeated it. “You’re spoofing us!” one of them shouted. “Give me the earphones.” And he snatched them from my head. Adjusting them on his own head, he spelled out to us, “C-Q C-Q C-Q D-E engineer ticked off into space: “Cabot Cabot Cabot D-E—” “Has this station a call letter?” he hurriedly asked me. “Yes,” I answered quickly, “One-X-X-B.” “One-X-X-B,” he continued the ticking “K.” Interplanetary communication was an established fact at last! And not with Mars after all these years of scientific speculations. But what meant more to me was that I was again in touch with my classmate Myles Standish Cabot, the radio man. The next day a party of prominent scientists, accompanied by a telegrapher and two stenographers, arrived at my farm. During the weeks that followed there was recorded to the earth. I have edited those notes into the following coherent story. II TOO MUCH STATIC boiling seas no man knew. 9 During his stay on my farm, Cabot had built the matter-transmitting apparatus, with which he had shot himself off into space on that October night on which he had received the message from the skies: “S O S, Lilla.” A thunderstorm had been brewing all that evening, and just as Myles had placed himself between the coordinate axes of his machine sat down again, and wrote: “I fully realize the futility of was and how he had got here. Suddenly, however, his ears were jarred by a familiar He fell to wondering, vaguely and pleasantly, where he for the three other Formians halted, and Doggo advanced alone. By the agitation of the beast’s antennae the earth man could see that it was talking to him. But Myles no longer possessed the wonderful electrical headset which he had contrived and built during his previous visit to that planet, so as to talk with Cupians and Formians, both of which races are earless and converse by means of radiations from their antennae. So he picked up two sticks from the beach, and held them projecting from his forehead then threw them to the ground with a grimace of disgust and pointed to his ears. Doggo understood, and scratched with his paw in Cupian following into writing: (or, rather, claws) of his old enemies, the Formians? He her from that peril, whatever it was, which had caused her to flash that “S O S” a hundred million miles across the solar system from Poros to the earth. He wondered what could have happened in Cupia since These and a hundred other similar questions flooded in upon the earth-man, as the Formian airship carried him, a captive, through the skies. Apparently a few survivors of the accursed race of Formians with the unseen sun. With a sweep of his paw, Doggo indicated that this was of a Formian. come all you Formians, whose race I thought had been Formia YURI OR FORMIS? No eggs. How can your race continue? For you Formians are regarded the Formians as mannish. And rightly so, for they among the Cupians. Furthermore, all Formians, save only the reigning Formis herself, were called by the Porovian of some importance among the Formians.” head of an empire of the Formians, by the Formians, and for the Formians exclusively.” On a raised platform stood the ant queen, surmounted by approached you.” At about this point the conversation was interrupted by a worker ant who brought food: roast alta and green aphid During the meal conversation lagged, owing to the difficulty Formia. Formis, daughter of Doggo! What say you?” correspondence. 17 “Doggo,” Myles wrote, “can you get to the antenna of the queen?” The ant-man indicated that he could. extant merely the ant-man’s concluding words: “Meanwhile you are my prisoner.” Doggo then rang a soundless bell, which was answered by a worker ant, whom he inaudibly directed to bring sufficient draperies to form a bed for the earth-man. These England farmhouse. Then had come the S O S message from the skies and here he was now, millions of miles away through space retiring on matted silver felting on the “Sorry I can’t assist you,” the earth-man wrote. “How This will be the signal for the proclaiming of Queen Formis.

<question>:
How do Formians communicate with each other?

<options>:
A Via pencil and paper
B Via radio
C Via Morse code
D Via antenna

<answer>:

D