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

<passage>:
were roofed by a perpetual ceiling of dust-clouds. A light glimmered in one of the huts. Feminine voices rippled across the clearing and into the jungle. There was laughter, then someone's was—compared to her friends'—voluptuous. She rested against the door-frame, watching the red of the afterglow deepen to purple. "I want romance," she said, so softly that the girls "Goodbye, Koroby!" Then she turned and stepped out into the night. "This way," the litter-carrier announced, touching the girl's arm. They stumbled over the rutted clearing toward the twinkling sparks that were the lights of the other litter-bearers, colored sparks as befitted a wedding-conveyance. The winking lights were enclosed in shells of The procession filed into the jungle, into a tunnel of arched branches, of elephant-eared leaves. Above the monotonous music came the hiss of the torches, the occasional startled cry of a wakened bird. The glow of the flames, in the dusty air, hung around the party, sharply defined, like a cloak of light. At times a breeze would shake the ceiling of in the grass. Then the girl heard it—a shrill, distant whine, dying away, then growing louder—and louder—it seemed to be approaching—from the sky— louder—Koroby's hands clenched nervously on the wreaths at her throat— Then, far ahead, a series of bright flashes, like the lightning of the She waved a hand. "Yes, go on." The litter resumed its gentle swaying, but the music did not start again. Then, from the direction of the light-flashes, a glow appeared, shining steadily, green as the flashes had been. Noticing it, Koroby frowned. Then the path bent, and the glow swung to one side. Suddenly Koroby reached out, tapped the shoulder of the closet bearer. "Take me to that light!" she persisted. They set the litter down. "We can't do that," one man said to another. Koroby stepped out to the path, straightened up, her eyes on the glow. "You'd better," she said ominously. "Otherwise, I'll make a complaint to Yasak—" The men eyed each other, mentally shrugging. "Well—" one yielded. The girl whirled impatiently on the others. "Hurry!" she cried. "If you won't take me, I'll go by myself. I must get to that fire, whatever it is!" She put a hand to her heart. "I must! I must!" Then she faced the green glare again, smiling to herself. "You can't do that!" a carrier cried. feet caught in the tangled grass, and clouds of fine dust arose from the disturbed blades. By the time they reached the source of the light, they were quite demoralized. The musicians had not accompanied them, preferring to carry the message to Yasak in the Stone City that his prospective dust on her face had hid its youthful color, aging her. The expedition emerged from the jungle on a sandy stretch of barren land. A thousand feet away a gigantic metal object lay on the sand, Koroby stopped short, clasping her hands and involuntarily uttering a squeal of joyful excitement, for between her and the blaze, his eyes on the destruction, stood a man..... He was very tall, and his shoulders were very wide. Oh, but he looked Koroby hastily grasped a corner of her gown, moistened it with saliva, and scrubbed her face. She rearranged her hair, and stepped forward. "Don't go there—it's magic—he'll cast a spell—!" one of the bearers lovely body graceful as a cat's, her face radiant. The man did not hear her. She halted behind him, waited silent, expectant, excited—but he did not turn. The green fire sputtered upward. At last the girl stepped to the man's side and gently touched him again. He turned, and her heart faltered: she swayed with bliss. The stranger did not speak, merely gazed deeply into Koroby's eyes. And she, returning the gaze, wondered if he was peering into her very soul. The words of a folk-ballad came to her: peering into hers as though he were searching for something he had lost in them. She spoke her thought: "What are you doing? You seem to be reading my mind!" Koroby watched him, forgot her fear, and went eagerly to him, took his month gaped in surprise, and he continued, "As for the distance to Koroby cut him short. "What's your name?" She pointed. "The Stone City's that way." "Good," he said. "Let's go there." They took another glance at the metal globe and the green fire, which by now had died to a fitful glimmer. Then the stranger and the girl started toward the jungle, where the litter-bearers awaited them. As the party was struggling through the prairie's tall grass, the man she was bleeding from many scratches. She tripped over tangled roots and exclaimed in pain. Then the man took one of the strange implements from his belt, pressed a knob on it, and light appeared as if by magic! He handed the stick to Koroby, but she was afraid to touch it. This was a strange light that gave no heat, nor flickered in the breeze. Finally Robert dipped down, scooped her up, and carried her. Lights glimmered ahead shouts reached them. It was a searching party, Yasak in it. The litter-carriers who could still speak blurted out what had happened. "A green light—loud sounds—fire—this man there—" and then dropped into sleep. "Yasak's out somewhere. The stranger man is in the room at the end of Koroby huddled on a chair, sobbing. Then she dried her eyes on the the armor-rack at the main hall on her way outside, and snatched up a siatcha —a firestone. Then she slipped outside and down the street. The City's wall was not far behind. Robert was visible in the distance, striding toward his sky-ship, a widening cloud of dust rising behind to hear. She watched him a little longer. Then she deliberately stooped and drew the firestone out of its sheath. She touched it to a blade of the tall grass. A little orange flame licked up, slowly quested along the blade, down to the ground and up another stem. It slipped over to another stem, and another, growing larger, hotter—Koroby stepped back from the writhing fire, her hand protectively over her face. The flames crackled at first—like the crumpling of thin paper. Then, as they widened and began climbing hand over hand up an invisible ladder, they roared. Koroby was running back toward the City now, away from the heat. The fire spread in a long line over the prairie. Above its roar came shouts from the City. The flames rose in a monstrous twisting pillar, brighter than even the dust-palled sky, lighting the the wall than where the others were gathered. They could glimpse Robert now and then. He was running, trying to outrace the flames. Then they swept around him, circling him—his arms flailed frantically. The fire had passed over the horizon. The air was blue with smoke, difficult to breathe, and ashes were drifting lightly down like "He fell about here," he said, and began to probe the ashes with the stick. He struck something. "Here he is!" he cried. The others hurried to the spot and scooped ashes away, dog-fashion, until Robert's remains were laid clear. There were exclamations of amazement and perplexity from

<question>:
Under what circumstances does Yasak first reunite with Koroby during the story?

<options>:
A He went looking for her when she was late to their wedding
B Some of the wedding procession alerted him to her distress
C He intercepted the wedding procession in a grassy field
D He was investigating the source of the green flame when he saw her

<answer>:

B