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

<passage>:
Marooned on a world within a world, aided by a slim girl and an old warrior, Patrolman Sisko Rolf was fighting his greatest the U.S. copyright on this publication was renewed.] "The outlaw ships are attacking!" Old Garmon Nash's harsh voice snapped like a thunderclap in the cramped rocket flyer's cabin. "Five or six of Sisko Rolf's stocky body was a blur of motion as he cut the rocket Rolf swung the lax controls over hard as the bursts of fire revealed a In a slow sort of wonder Rolf felt the scrape of rock against metal, Down plunged the battered ship, downward ever downward. Somehow Rolf split open like a rotten squash, and Rolf felt himself Much later Rolf groaned with the pain of bruised muscles and tried to There was light in the narrow pit in which he found himself, light and heat from the yet-glowing debris of the rocket flyer. The outlaws had blasted the crashed ship, his practiced eyes told him, and Garmon Nash must have died in the wreckage. He was alone in the waterless trap of a deep crevice. In the fading glow of the super-heated metal the vertical walls above Rolf laughed. Without a pressure mask on the surface of Mars an The young patrolman unzippered his jacket pocket and felt for the flooded into his muscles he set off around the irregular wall of the He found the opening less than ten paces from the starting point, an gutted ship was failing and he felt for the solar torch that hugged glowed redly from its lensed prison to reveal the rocky corridor light reached his eyes Rolf did not know—it had seemed an eternity of Rolf capped the solar torch. No use wasting the captive energy "They may have found the sunken seas of Mars," thought Rolf as he moved the other half. Toward this barrier the spinner bore him, and Rolf was it seemed to Rolf that he must be falling free through black dust, and he came to a stop. Deftly Rolf nested the rocks ahead. Rolf's slitted gray eyes narrowed yet more and his hand The voice had spoken in English! Rolf took a step forward eagerly and Rolf found himself staring, open-mouthed, at the sleek-limbed vision The girl laughed, a low liquid sound that made Rolf's heart pump She smiled again as Rolf's face slowly reddened. "Do not be ashamed," Rolf threw up the mental block that was the inheritance from his "Sorry," said the tall man as Rolf sprang easily from the ground to "She one of them?" Rolf's voice was low, but he saw Altha's lip twitch. Rolf followed the direction of the other's pale blue eyes. Overhead now lifted above the restless dark waters of a vast sea. Rolf realized with "There," roared Tanner's voice, "is one of the seas of Mars." "One," repeated Rolf slowly. "You mean there are more?" "Dozens of them," the older man's voice throbbed with helpless rage. "Enough to make the face of Mars green again. Cavern after cavern lies Rolf felt new strength pump into his tired bruised muscles. Here lay "Mark!" The girl's voice was tense. Rolf felt her arm tug at his sleeve A hundred paces away Rolf made the dark shapes of armed warriors as Rolf watched the column of barbarically clad warriors file out upon the "Right." Tanner's fingers bit into Rolf's arm. "Pray that the wind does Rolf's eyes slitted. There was something vaguely unhuman about those Rolf raised his expoder, red anger clouding his eyes as he saw these Gone now was their chance for a surprise attack on the isolated canyons Rolf and Mark Tanner came to their feet. Rolf's expoder rattled briefly like a high-speed sewing machine as he fallen sisters. Mark Tanner's bow twanged again and again as he drove arrows at the bloodthirsty warrior women. But the Furry Ones ran fearlessly into that rain of death. The expoder hammered in Rolf's heavy fist. Tanner smashed an elbow into Rolf's side. "Retreat!" he gasped. "Now where?" Rolf snapped another burst of expoder needles at the furry attackers as he asked. "To the vaults beneath the Forbidden City," Mark Tanner cried. "None went bounding away along a shadowy crevice that plunged raggedly into the heart of the Barrier. Rolf blasted another spurt of explosive shattered heart. An unseen furry shape sprang upon Rolf's shoulders Tanner's finger pointed. "Altha!" Rolf saw the graceful wings of the glider riding the thermals back toward the Barrier. "She had warned the "The weasel heads won't follow us here?" asked Rolf. Rolf laughed. "Like the pleasure globes of the wealthy on Earth." "But," Rolf frowned thoughtfully, "what keeps Lomihi from crashing into "The outlaws!" he cried. "They're after Altha." Rolf caught a glimpse of a sleek rocket flyer diving upon Altha's frail the old man pushing another crudely constructed glider toward the outer section of the wall swung slowly inward. Rolf sprang to his side. The older man's eyes were hot. He jerked at Rolf's hands and then Rolf pushed up and outward with all the strength of his weary muscles. had taken shelter, noting as he did so that the rocket flyer had landed A man stood on guard just outside the flyer's oval door. Rolf lined up comrades. But if the outlaw saw him Rolf knew that he would be the about. Rolf pressed the firing button Rolf snapped his weapon overhand at the Frog's hairless skull. The momentarily. In that instant Rolf launched himself from the open They went down, Rolf swinging his fist like a hammer. He felt the Frog the guard's rifle expoder in his grasp the problem of escape from the inner caverns was solved. He would rescue the girl, stop at the dropped behind a sheltering rocky ledge, and he caught a glimpse of two green-clad men dragging the bronze-haired body of the girl he had come to save into the shelter of the flyer. A green bulge showed around the polished fuselage and Rolf pressed his This sledge was hammering relentlessly as Rolf sensed his first Cautiously his head twisted until he could look forward toward the By degrees Rolf worked his arm down to his belt where his solar torch The ship bumped gently as it landed and the thrum of rockets ceased. The cabin shifted with the weight of bodies moving from their seats. Rolf heard voices from a distance and the answering triumphant bawling "Fire!" There was panic in the outlaw's voice. Rolf came to his knees not on the prisoners, and so the impact of Rolf's horizontally propelled body drove the breath from his lungs before his hand could drop to his belted expoder. The outlaw was game. His fists slammed back at Rolf, and his knees jolted upward toward the patrolman's vulnerable middle. But Rolf smoke, and then the fingers of the outlaw clamped around Rolf's throat trek afterward through the dark tunnels had sapped his strength, and Rolf swung, all the weight of his stocky body behind the blow, and the burned and the conditioning unit was clearing the air. "Patrolman," the girl's voice was beside him. "We're safe!" "Everything bongo?" Rolf wanted to know. Rolf grinned up at her. "Need to?" he asked. all the time," she quipped. Then they were over the Barrier and Rolf saw the last of the beaten Furry Ones racing back across the great wall toward the Plains of Rolf snorted. "Shorty," he said disgustedly as they landed, but his arm

<question>:
What was Rolf looking for when he set off around the wall of the pit?

<options>:
A Garmon
B Light
C Food
D Other survivors

<answer>:

B