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 tree named Ashlew, "you're it, Sonny! Hang on there while I signal the Life by root!" Kolin sensed a lack of direct attention. The rustle All about him was natural, caused tree," he muttered. "If Yrtok Peter Kolin had to admit that casualties might have been far worse. "I don't know," said Kolin. "The penalty for desertion—" "Whoosh! Who'd find you? You could be a bird, a tree, even a cloud." Silenced but doubting, Kolin permitted himself to try the dream on for size. . He lined them up as if on parade. Kolin made himself He considered what form might most easily escape the notice of search parties and as is suitable. It may be his musings: mere hope of escape was unsatisfying after the outburst that had defined his fuming hatred for Haurtoz. I'd better watch myself! he for the way they make us You know why they don't?" "Why?" wheezed Ashlew. "They're scared that without talk of war, and scouting of treatment that left the subject suitably "re-personalized." Kolin had heard of instances wherein mere unenthusiastic posture had betrayed State. Then the gravy train would get blown up—and I mean blown up!" The tree was silent for a moment. Kolin felt the branches stir meditatively. Then Ashlew offered a suggestion. "I could tell the Life your side of it," he hissed. "Once Kolin permitted himself to wonder when anyone might get some rest, but assumed a of a proper viewpoint That, at least, was the official line. Kolin found himself in a group with Jak Ammet, a third cook, and Eva Yrtok, repairs, Yrtok could be spared of favoring themselves in regard to food. They would go without. Kolin maintained a standard expression Yrtok, a dark, lean-faced girl, led the way with a quiet monosyllable. She carried the cast forth by one of the bushes Kolin's party had of utmost urgency. Ammet followed, and Kolin brought passed. Along the edges, the haze faded raggedly into thin permitted to use for messages up the rear. To reach their assigned sector, they had to climb formed a cohesive body. They One of Chief Slichow's staggering flunkies, stealing a forbidding ridge of rock a few seconds of relaxation on the pretext of dumping an Yrtok and Ammet paused momentarily before descending. Kolin shared their sense of isolation. They would be out of sight of authority and responsible advantage of the breeze. Throughout the cloud of spores, the mind formerly known as Peter Kolin congratulated itself upon its For all Kolin could tell, he and the others were isolated Nearer to the original shape of the Life than Ashlew , he thought. He paused to consider the state of the tree named Ashlew, half immortal but rooted to one spot, unable to float on got in a world bounded by the Yrtok led the way along a breeze or through space itself on the pressure of light. plentiful, interspersed with spore was taking charge of the body of Chief Slichow at that very instant. scrubby thickets of tangled, spike-armored bushes. Occasionally, thought Kolin. Some of me must drift through the airlock. "Be a job to find anything and Kolin agreed. Finally, after a longer hike than he had anticipated, they edible here," grunted Ammet, approached the edge of the Yrtok paused to examine some purple berries glistening dangerously on a low shrub. Kolin through as a tropical jungle," were about the same height. They craned their necks to estimate the altitude of the branches. The depths behind it looked dark and impenetrable. "We'd better explore along the edge," decided Yrtok. "Ammet, now is the time to go back and tell the Chief Ammet! " Kolin looked over his shoulder. Fifty meters away, Ammet sat beside the bush with the purple berries, utterly "He must have tasted some!" exclaimed Kolin. "I'll see how he is." He ran back to the cook and shook him by the shoulder. Ammet's head lolled loosely to one side. His rather heavy features were vacant, lending him a doped appearance. Kolin straightened up and beckoned to Yrtok. a somber, brooding grayness. "Hope she didn't eat some stupid thing too!" he grumbled, trotting back. As he reached her, whatever Yrtok was examining came to life and scooted into the underbrush with a flash of greenish fur. All Kolin saw was that it had several legs too many. He pulled Yrtok to her feet. She pawed at him weakly, eyes as vacant as Ammet's. When he let go in sudden horror, she folded gently to choice of form. the ground. She lay comfortably on her side, twitching away. When she began to smile dreamily, Kolin backed away. The corners of his mouth one hand as if to brush something jetting off! What I need is an easy tree to climb." seemed the most promising choice. At first, Kolin saw no way, but then the network of vines clinging to the rugged trunk to climb. "I should have brought Yrtok's radio," he muttered. "Oh, well, I can take it when I come down, if she hasn't snapped out of her spell by then. Funny … I wonder if Footholds were plentiful among the interlaced lianas. Kolin progressed rapidly. When he reached the first thick limbs, twice head height, he felt safer. Later, at what he hoped was the halfway mark, he hooked one knee over a branch and paused to wipe sweat from his eyes. Peering down, he discovered looking for, Sonny!" something remarked in a soughing wheeze. Kolin, slipping, grabbed desperately for the branch. His fingers clutched a handful of twigs and leaves, which just barely supported him until he regained a grip with the other hand. The branch quivered resentfully under him. "Careful, there!" whooshed the eerie voice. "It took me all summer to grow those!" Kolin could feel the skin crawling along his backbone. "Who "Name's Johnny Ashlew. Kinda thought you'd start into a tree before." Kolin looked about, seeing little but leaves and fog. "I have to climb down," he told himself in a reasonable tone. "It's bad enough that the Kolin, testing the firmness of a vertical vine. "Just 'Mr. Ashlew,' considering my age." world ain't all it looks like." "It isn't, Mr. Ashlew?" asked Kolin, twisting about in an effort to see what the is, by the thing that first in time, you'd be bouncing off my roots right now!" "Th-thanks!" grunted Kolin, hanging on grimly. "He's very handy," agreed Kolin politely. He groped for a foothold. "Well … matter of fact, I much, even with the Life's way of thinking. It a tree, and then he came along to take advantage of it!" Kolin braced himself securely to stretch tiring muscles. "Maybe I'd better stay a "You're about fifty feet up," the sighing voice informed "I wouldn't want to do that, Mr. Ashlew." "There's just one thing. your ship in any form that could tell tales." "Listen!" Kolin blurted out. "I wasn't so much enjoying being what I was that them places. Must be tough just to live." Suddenly, Kolin found himself telling the tree about life on Haurtoz, and of the officially Somehow, the oddity of talking to a tree wore off. Kolin heard opinions spouting out which he had prudently kept bottled up for

<question>:
Which description is the best representation of Yrtok's role in the story?

<options>:
A She figured out what was wrong with Ammet when he fell.
B She was the reason they had a quality water supply.
C She found the purple berries, an important source of food for the stranded crew.
D Her fall leads Kolin to find Ashlew

<answer>:

D