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 Sisko Rolf's stocky body was a blur of motion as he cut the rocket their underground hideout by that water-runner we tried to capture. We can't escape, that's certain. They know these caverns better than.... We'll down some of them, though." Planet Patrol ship as he swung the deadly slimness of his rocket approaching outlaw flyers. Rolf swung the lax controls over hard as the bursts of fire revealed a 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 least the air was thick enough to support life, and somewhere nearby the outlaws who smuggled their precious contraband water into the water-starved domes of North Mars lay hidden. The young patrolman unzippered his jacket pocket and felt for the Rolf capped the solar torch. No use wasting the captive energy ahead, headquarters where renegade Frogs, Venusians from the southern sunken marshes of Mars, and Earthmen from dusty North Mars, concealed their precious hoard of water from the thirsty colonists of North Mars. "They may have found the sunken seas of Mars," thought Rolf as he moved alertly forward, "water that would give the mining domes new life." His fists clenched dryly. "Water that should be free!" 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. "Only we were not lost on the surface," explained Tanner, his booming voice much too powerful for his reedy body, "Wayne Stark was searching for the lost seas of Mars. Traced them underground. Found them too." He 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 Rolf felt new strength pump into his tired bruised muscles. Here lay he could lead the scientists of North Mars to this treasure trove of water.... "Mark!" The girl's voice was tense. Rolf felt her arm tug at his sleeve the desert half of Lomihi. "Enemies?" he whispered to Mark Tanner hoarsely. "Right." The older man was slipping the stout bowstring into its "I must warn them." Altha's lips thinned and her brown-flecked eyes flamed. "The outlaws may capture," warned Tanner. "They have taken over the swiftly back along a rocky corridor in the face of the Barrier toward the ruins of ancient Aryk. Tanner shrugged his shoulders. "What can I do? Altha has the blood of the Hairy People in her veins. She will warn them even though the outlaws have turned her people against her." 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 raised his expoder, red anger clouding his eyes as he saw these Rolf and Mark Tanner came to their feet. Rolf's expoder rattled briefly like a high-speed sewing machine as he Tanner smashed an elbow into Rolf's side. "Retreat!" he gasped. "Now where?" Rolf snapped another burst of expoder needles at the furry 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 island is the answer," said Tanner. "Somehow it blocks the force of gravity—shields Lomihi from...." He caught his breath suddenly. "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 him grin. He drove directly toward the grounded ship. With this rocket flyer he could escape from Lomihi, return through the thirty-seven caverns to the upper world, and give to thirsty Mars the gift of limitless water again. 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 go limp and he loosed a relieved whistle. Now with a rocket flyer and 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 Forbidden City for Mark Tanner, and blast off for the upper crust forty miles and more overhead. A green bulge showed around the polished fuselage and Rolf pressed his This sledge was hammering relentlessly as Rolf sensed his first Rolf heard voices from a distance and the answering triumphant bawling of his two captors. The moment had come. He turned the cap of the solar "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 The outlaw was game. His fists slammed back at Rolf, and his knees jolted upward toward the patrolman's vulnerable middle. But Rolf Rolf swung, all the weight of his stocky body behind the blow, and the "Everything bongo?" Rolf wanted to know. Rolf grinned up at her. "Need to?" he asked. Then they were over the Barrier and Rolf saw the last of the beaten Nyd. He nosed the captured ship down toward the ruined plaza of the Forbidden City. Once Mark Tanner was aboard they would blast surfaceward with their thrilling news that all Mars could have water in plenty again. Rolf snorted. "Shorty," he said disgustedly as they landed, but his arm

<question>:
What is Rolf's new plan when he spots the rocket?

<options>:
A Now that he knows the location of the water, he'll be able to return to grab it for himself.
B He'll have a way out of the caverns at last, be able to escape.
C He can escape the fighting and leave Tanner and the girl behind.
D He'll be able to distribute water to Mar's colonies, and get out with Tanner and the girl.

<answer>:

D