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

<passage>:
Irgi was the last of his monster race, guardian of a dead planet, master of the secret of immortality. It was he whom the four men from Earth had to of time dwelling alone amid the marble halls of the eon-ancient city, but he knew that much. There were no others. Only Irgi, alone. He moved now along the ebony flooring, past the white marble walls hung with golden drapes that never withered or shed their aurate luster in the opalescent mists that bathed the city in shimmering whiteness. They hung low, those wispy tendrils of mist, clasping everything in their clinging shelter, destroying dust and germs. Irgi had discovered the mist many years ago, when it was too late to save his kind. He had flung a vast globe of transparent metal above this greatest of from the far-off jungle city of Kreed had he brought the riches of the Urg and set them up. Irgi enjoyed beauty, and he enjoyed work. It was the combination of both that kept him sane. with a pale blue luminescence that glimmered upon metal rods and bars and ten tall cones of steelite. In the doorway, Irgi paused and ran his eyes about the chamber, sighing. This was his life work, this blue hum and throb. Those ten cones lifting their disced tips toward a circular roof bathed in, and drew their power from, a huge block of radiant white matter that hung suspended between the cones, in midair. All power did the cones and the block possess. There was nothing they could not do, if Irgi so willed. It was another discovery that came too late to save the Urg. Irgi moved across the room. He pressed glittering jewels inset in a control panel on the wall, one after another, in proper sequence. The blue opalescence deepened, grew dark and vivid. The hum broadened into a hoarse roar. And standing out, startlingly white against the blue, was the queer block of shining metal, shimmering and pulsing. Irgi drew himself upwards, slowly turning, laving in the quivering bands of cobalt that sped outward from the cones. He preened his body in their patterns of color, watching it splash and spread over his then spread outwards, all over his huge form. Irgi was immortal, and the blue light made him so. "There, it is done," he whispered to himself. "Now for another oval I can roam all Urg as I will, for the life spark in me has been cleansed He touched the jeweled controls, shutting the power to a low murmur. He turned to the bronze doors, passed through and into the misty halls. "I must speak," Irgi said as he moved along the corridor. "I have not spoken for many weeks. I must exercise my voice, or lose it. That is "Yes, I will use my voice tonight, and I will go out under the dome and look up at the stars and the other planets that swing near Urg, and I will talk to them and tell them how lonely Irgi is." He turned and went along a hall that opened into a broad balcony which stood forth directly beneath a segment of the mighty dome. He stared upon him. "Stars," he whispered, "listen to me once again. I am lonely, stars, and the name and fame of Irgi means nothing to the walls of my city, nor to the Chamber of the Cones, nor even—at times—to Irgi himself." He paused and his eyes widened, staring upwards. twisting his features to a hard mask. "Think she's got the stuff, skipper?" he asked Emerson. "The spectroscope'll tell us. Break it out." "You bet." pressed in on them. "Think it's safe to go out?" asked Nichols. "Try the atmospheric recorder," said Emerson. "If the air's okay, I'd his sun-blaster—felt it ripped from his fingers, knew a hard blackness thrashing down at him. He went backwards, sickened.... Irgi stared at the things that lay on the white flagging. Queer beings always maintained that life would be different on other worlds. Life here on Urg took different patterns. Irgi bent to wrap long arms about the queer beings, lifting them. His eyes were caught suddenly by the lumps protruding from their arms and legs, from face and chest. The growth disease! That was bad, but Irgi knew a way to cure it. Irgi knew a way to cure anything. moments of agony than a death through a worse. And if he could not speak to them, they could speak to him, through their minds. Once unconscious, he could tap their memories with an electrigraph screen. That should be absorbing. It made Irgi happy, reflecting upon it, and Irgi had not known happiness for a long time. From the passage he hurried into a large white room, fitted with glass vials and ovules and glittering metal instruments, so many in number that the room seemed a jungle of metal. Down on flat, smooth tables Irgi dropped his burdens. With quick tendrils he adjusted straps to them, bound them securely. From a small, wheeled vehicle he took a metal rod and touched it to their foreheads. As it met the flesh, it hummed once faintly. "It's short-circulated their nervous systems for a while, absorbed the electric charges all intelligent beings cast," Irgi said aloud, glad at this chance to exercise his voice. "They won't be able to feel for some time. When the worst pain will have passed, they will recover. And now to examine their minds—" He fitted metal clamps over their heads and screwed them tight. He wheeled forward a glassy screen plugged in the cords that dangled from its frame to the metal clamps. "I wonder if they've perfected this," Irgi mused. "They must be aware that the brain gives off electrical waves. Perhaps they can chart those waves on graphs. But do they know that each curve and bend of those waves represents a picture? I can translate those waves into pictures—but can they?" He slouched a little on his tentacles, squatting, gazing at the screen as he flipped over a lever. A picture quivered on the screen grew nebulous, then cleared. Irgi him with a spaceship, reciting the need of radium, the dread of the plague. The thoughts of this Emerson were coming in clearer, as Irgi in he could save it ! Irgi unfastened clamps, and rolled the screen aside. He reached to a series of black knobs inset in the wall, and turned them carefully. Turning, he saw the figures of the four men stiffen to rigidity as a "When they realize that I am their friend, they will gladly hear my counsels!" Opening the laboratory door, Irgi passed out and closed it behind him. It was the sweat of agony trickling down his forehead and over his eyes and cheeks that woke Emerson. He opened his eyes, then clamped them It woke the others. They too, bellowed and screamed and sobbed, and their arms and legs writhed like wild things in a trap. "Got to get free," Emerson panted, straining against the wristbands. aloft and laughed harsh triumph. "I'll have you all loose in a second," he grunted, ripping straps from his body.

<question>:
How is communication between the Terrans and Irgi conducted?

<options>:
A The Terrans have a universal translator, and while it takes awhile to dial it in, they are eventually able to have two-way communication with Irgi in his language.
B Irgi restrains and sedates the crewmen, then hooks them up to an instrument that converts brain wave activity to images, and he is able to see what they are thinking. This is one-way only, from the Terrans to Irgi.
C At first, Irgi realizes that he is transmitting at a frequency below the threshold of human hearing. After he raises the frequency above twelve per second, the crewmen are able to hear him, and he can hear them.
D Irgi provides the crewmen with a brain wave recorder, and hooks it up to himself and lets the crew see the images. When they understand, they hook themselves up so that Irgi can also see the images of their thoughts.

<answer>:

B