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

<passage>:
Sly, brave and truculent, the Qornt back to watch the encounter. Retief had thrown a turn of violet silk around Qorn's left wrist, bound it to the alien's neck. Another wisp of stuff floated from Qorn's held all humans in contempt—except one! "Gentlemen, are any of you familiar with a race known as the Qornt?" Qorn got a leg under him His Supreme Excellency The Qorn, Regent of Qornt, Over-Lord of the presence in mandated territory of Terrestrial squatters, has the honor "What good would that do? Qornt are Qornt. It seems there's always one controlled soil—and without so much as a flicker from the instruments the new Qornt stepping on our heels—" "I've lost the thread," Magnan said. "Who are the new Qornt?" "We're up against something new, gentlemen! I've considered every hypothesis from cloaks of invisibility to time travel! The fact is—the Qornt fleets are indetectible!" slapped the table. The Military Attache pulled at his lower lip. "In that case, we can't "Very likely. 'The milder the Verpp, the wilder the Qorn,' as the old "What do Qornt turn into?" Retief asked. "Hmmmm. That's a good question. So far, none have survived Qornthood." "No cloak and dagger work, gentlemen! Long range policy will be worked out by Deep-Think teams back at the Department. Our role will couple of volunteers with plastic beaks—" be a holding action. Now I want suggestions for a comprehensive, Confidential Terrestrial Source Section spoke up. "I'll fit out a Terrestrials over on Guzzum—that was a mad notion. We had no idea what Qornt "Only a dead Qornt stays home when Attack day comes. And even if couldn't locate the Qornt. We'll go back now and report—" clutched at his arm. There was a sound of crackling foliage. Twenty feet ahead, a leafy branch swung aside. An eight-foot biped stepped into view, long, thin, green-clad legs with back-bending knees moving in quick, bird-like steps. A pair of immense black-lensed goggles covered staring eyes set as the creature cocked its head, listening. Magnan gulped audibly. The Qornt froze, head tilted, beak aimed directly at the spot where the Terrestrials stood in the deep shade of darted to the left. The first Qornt pounced, grappled Magnan to its stopped, right fist cocked. The two Qornt lay groaning feebly. countenances it has ever been my misfortune to encounter," Magnan said. "It hardly seems fair. Eight feet tall and The smaller of the two captive Qornt ran long, slender fingers over trousers. "It's not broken," he whistled nasally in passable Terrestrial, eyeing Magnan through the heavy goggles, now badly cracked. "Small thanks to whistle escaped—"at being taken for a Qornt." "Aren't you a Qornt?" like Qornt." "Oh, not at all—except perhaps to a Terrestrial. The Qornt are they do nothing but quarrel. A drone caste, actually." "Not at all! A Verpp wouldn't think of fertilizing a Qornt." "Why, the Qornt are argumentive, boastful, lacking in appreciation "How many Qornt would you say there are at Tarroon?" "You mean that there are only fifteen or twenty individual Qornt in Another whistle. "Not at all. I was referring to the local Qornt only. "And the Qornt are responsible for the ultimatum—unilaterally?" mating—such a tedious business—and of course the Qornt are tied up with their ceremonial feasting. I'm afraid no one will take any notice "Do you mean to say," Magnan demanded, "that these ferocious Qornt, who openly avow their occupied world—would ignore Terrestrials in their "Yes, yes, of course. Qornt Hall lies here inside the village." "No wonder we didn't observe their works from the air," Magnan muttered. "Camouflaged." He moved hesitantly through the opening. The party moved along a wide, deserted tunnel which sloped down appeared to be primitive incandescent panels. "Few signs of an advanced technology here," Magnan whispered. "These high-pitched screeching. "Softly, now. We approach Qornt Hall. They "When will the feast be over?" Magnan called hoarsely. that these Qornt are allowed to embark on piratical ventures of this tattered banners, scarred halberds, pikes, rusted longswords, crossed spears over patinaed hauberks, pitted radiation armor, corroded power three strumming slender bottle-shaped lutes, or pranced an intricate-patterned dance, unnoticed in the shrill uproar as each of the magnificently draped, belted, feathered and jeweled Qornt carried on a shouted conversation with an equally noisy fellow. "Ah, a moment," Zubb said. "Observe the Qornt—the tallest of the They mount a variety of weapons. The Qornt are fond of that sort of thing. Each of the Qornt has his own, of course. They're virtually anything that annoys the Qornt, it's Qornt-like behavior in others. Now forward, gibbered, waving his arms excitedly. Qorn pushed back his hair, springing out in a giant halo around the grayish, porous-skinned face, was wiry, stiff, moss-green, with tufts of chartreuse fuzz surrounding what appeared to be tympanic membranes. The tall head-dress of scarlet silk and purple feathers was slightly askew, and a loop of pink pearls had slipped down above one eye. Qorn looked Retief over in silence, then belched. "Stay back!" Qorn hooted. "Stand over there where I can keep an eye on "Not here, you're not!" Qorn trumpeted. "Want peace, do you? Well, I There was a momentary silence from all sides. "I guess so," grunted a giant Qornt in iridescent blue with Qorn's eyes bulged. He half rose. "We've been all over this," he "Silence!" Qorn hooted. "No use your talking to my loyal lieutenants "I can lick any Qornt in the house." Qorn said. "That's why I'm Qorn." "Let them go," the blue and flame Qornt said glumly. "Oh, I doubt that," the blue-and-flame Qornt said. "Why should they?" assure you, it's useless. We Qornt "What?" Qorn trumpeted. Behind Retief, Magnan spluttered. Qornt Hall—uninvited, at that—and in chains—" "We'll take you on!" Qorn French-horned. "We're the Qorn! We glory in "Hogwash," the flame-and-blue Qorn cut in. "If it wasn't for you, Qorn, Retief watched as Qorn's aides helped him out of his formal trappings. doubt if old Qorn would weigh up at more than two-fifty standard pounds Across the cleared floor, Qorn shook off his helpers with a snort. arms. Qorn stalked forward, long lean legs bent, long horny feet and bejeweled Qornt—formed a wide circle, all eyes unwaveringly on the the narrow back, seized Qorn's neck in a stranglehold and threw his weight backward. Qorn fell on his back, his legs squatted out at an

<question>:
Why had the humans not been able to see the Qornt village from the air?

<options>:
A It was underground
B It was too small
C It was camouflaged
D It had an invisibility cloak

<answer>:

C