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 conquer to gain that secret—a tentacled Irgi was the last of his race. There was no one else, now been no others for hundreds and hundreds of years. Irgi had lost count but he knew that much. There were no others. Only Irgi, alone. 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 the cities of the Urg and filled it with the mist, and in it he had 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. Toward a mighty bronze doorway he went, and as his body passed an invisible beam, the bronze portals slid apart, noiselessly, opening to reveal a vast circular chamber that hummed and throbbed, and was filled 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. 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 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 chest and torso. Where it touched, a faint tingle lingered then spread Irgi was immortal, and the blue light made him so. "I must speak," Irgi said as he moved along the corridor. "I have not will talk to them and tell them how lonely Irgi is." 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." Emerson took his hands from the controls of the gigantic ship that "No use to think of failure. If it hasn't, we'll die ourselves, down Radium. And the Plague. It had come on Earth suddenly, had the Plague, and Venus, it began to be apparent that a lifetime of space travel meant a hideous death. Scientists attributed it to the cosmic rays, for out in space there was no blanketing layer of atmosphere to protect the fleshy tissues of man from their piercing power. It had long been a theory that cosmic rays were related to the birth of new life in the cosmos perhaps they were, said some, the direct cause of life. Thus by the young men who believed in a short life and a merry one, kept the and an inner coating of lead brought men into port raving with lead poisoning illusions. Cancer cases increased on Earth. It was learned that the virulent Hospitals were set up, and precious radium used for the fight. But the it out among the stars to find the precious radium in sufficient quantities to halt the Plague. "You know a better way to die, of course," replied Emerson. between two high, craggy mountains that rose abruptly from the tiny valley. It was just lighting as the faint rays of the suns that served this planet nosed their way above the peaks. Like a silver needle on a bands of color on a spectroscopic screen. With quivering fingers, Emerson twisted dials and switches. Emerson shook his head, frowning, suddenly glad that the others had "We can hope," said Emerson sharply. "Maybe they have some radium, Beneath it, the white towers and spires of the city reared in alien loveliness above graceful buildings and rounded roofs. A faint mist "It's empty," said Nichols heavily. "Deserted." "Something's alive," protested Emerson. "Something that spoke to us, that is controlling this green beam." "Bring us some," cried Emerson suddenly, and turned again to look out The green beam was gone, suddenly. The uncanny silence of the place pressed in on them. buckled them around their waists while Mussdorf swung the bolts of the door. He threw it open, and clean air, and faint tendrils of whitish mist came swirling into the ship. Nichols took a deep breath and his boyish face split with a grin. out !" yelled Emerson. The thing twisted sideways with an eerie grace, dodging the amber beams "Hold on," called Emerson, dodging and twisting, gun in hand, seeking a Irgi stared at the things that lay on the white flagging. Queer beings they were, unlike anything Irgi had ever conceived. Only two legs, only short work of them if an Urgian cat existed any more, and Irgi had Irgi bent to wrap long arms about the queer beings, lifting them. His 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. He had been glad to find these creatures. They were someone to Then there was the matter of the growth disease. He could eliminate 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. Irgi dropped his burdens. With quick tendrils he adjusted straps to 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 "I wonder if they've perfected this," Irgi mused. "They must be aware grew nebulous, then cleared. Irgi Even these remnants of humanity festered with the growth. A tall, lean man in white looked out at him. His lips moved, and 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 not understand, but the necessity for radium, and the danger of the Irgi stared upward at a colossal figure graven in lucent white marble. fame. He must have created a nation, or saved it. He wished there were Why, he had the power to make himself immortal! These creatures would 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 red aura drifted upward from the tabletop, passing through them as if they were mist, rising upwards to dissipate in the air near the ceiling. "That will prepare their bodies for the Chamber of the Cones," he said. "When they realize that I am their friend, they will gladly hear my Opening the laboratory door, Irgi passed out and closed it behind him. black-hearted spawn of a mismated monster did this to us. Damn him! it." "Maybe—maybe he's vivisecting us," moaned Nichols. "With rays or—or something—aagh! I can't stand it!" "Hang on, kid," gritted Emerson, fighting the straps. "I think it's Things are different. I want to learn the secret of those mists, Emerson. Something tells me I'd get a fortune for it, on Earth." Emerson squirmed helplessly, cursing him, saying, "What's gotten into

<question>:
What did Irgi find that could have helped his people if it weren't too late?

<options>:
A The mist and the globe of transparent metal
B Only the mist
C The mist and the blue light
D The mist and the invisible beam

<answer>:

C