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

<passage>:
Sheer efficiency and good management can Brian Hanson wondered dispassionately for a moment how his assistants alone, he let his only known emotion sweep through him, pride. He had that kept his body hard and resilient in spite of long hours spent in uniform. "Sorry, sir, but one of those rebels is loose in the Administration Center somewhere. We're making a check-up of all the apartments." "Well, you can check out I haven't got any blasted rebels in here." Brian closed the door in puzzlement. What the devil had that flat-foot eyes. Brian just stared at her in numbed fascination. That was what the Now he got it. This was probably the young fool's idea of a joke. He'd "All right, joke's over, you can beat it now." Brian slowly acquired a complexion suitable for painting fire plugs. struggling heroically to refrain from laughing and that didn't help his satisfaction of the unending extra work that was going to occur around complete relaxation. "Rebel? You're crazy! That was just ... Pete said ... rebel? Did you say rebel?" "Yeah, I said rebel, an' where is she?" she's a rebel and she's sure been raising plenty of hell around here. She got in and blew out the main communications control "Oh, it's all right, chief. You can trust me. I won't give you away." "There's nothing to give away, you fool!" Brian bellowed. "I don't know anything about any damn rebels. All I want is to get out of here—" "Gotcha, chief," Brent whispered understandingly. "I'll see if I can "Come here, you idiot!" Brian screamed after his erstwhile assistant. Brian retired to his cell bunk and clutched his aching head in Brian's eyes almost popped out as he saw a gloved hand reach around Brian felt as though something had kicked him in the stomach. She was bathrobe, leading a band of escaping rebels out of the company's best jail. Brian's hands opened the complicated lock in a matter of seconds. They brilliance as the floodlights snapped on. Brian faltered to a stop and Brian felt as though his stomach had fallen down around his ankles a gasping grunt of pain as one of the rebels went down. They were shooting to kill. "We've got to run!" the girl shouted. He started after her. Two surface transport vehicles waited around the corner. Brian and the rebels bundled into them and took away with a roar. The chase wasn't organized yet, and they soon lost themselves in The two carloads of rebels cruised nonchalantly past the Administration Center and pulled into a private garage a little beyond. "What are we stopping here for?" Brian demanded. "We've got to get away." "That's just what we're doing," Crystal snapped. "Everybody out." The rebels piled out and the cars pulled away to become innocuous parts of the traffic stream. The rebels seemed to know where they were going and that gave them the edge on Brian. They followed Crystal down into the garage's repair pit. "Oh, you don't have to whisper, we're safe enough here. This is one of the air shafts leading down to the old mines." "Old mines? What old mines?" "That's something you newcomers don't know anything about. This whole area was worked out long before Venus Consolidated came to the planet. These old tunnels run all under the city." level tunnel. "What do we do? Hide here?" "I should say not. Serono Zeburzac, head of McHague's secret police will be after us now. We won't be safe anywhere near Venus City." before he died," she said grimly. Brian was startled at the icy hardness of her voice. Two of the rebels pulled a screening tarpaulin aside and revealed one of the old-type ore cars that must have been used in the ancient mines. A brand-new atomic motor gleamed incongruously at one end. The rebels crowded into it and they went rumbling swiftly down the echoing passage. The lights of the car showed the old working, rotten and crumbling, fallen in in some places and signs of new work where the rebels had cleared away the debris of years. Brian struggled into a zippered overall suit as they followed a twisting, tortuous course for half an hour, switching from one tunnel gash in the wall of the cavern. Brian followed Crystal into the smaller of the two ships and the rest of the rebels manned the other. "Wait a minute, how do we get out of here?" Brian demanded. "Through that hole up there," the girl said matter-of-factly. The sides of the gap rushed in on the tips of the stubby wings. Brian the mountain while Brian struggled to get his internal economy back "Oh—I see," Brian said weakly and a few moments later he really did Consolidated police, cruised suddenly out from a mountain air station. set in grim lines as she pulled the ship up in a screaming climb. Brian Brian almost got to his feet when another wild maneuver hurled him back "Look! They're hit!" Brian felt sick. white flowers of half a dozen parachutes blossoming around it. Brian jerked and jumped like crazy marionettes as the bullets smashed into them. It was over in a few moments. The dead rebels drifted down into the mist-shrouded depths of the valley. outrage. "They didn't have a chance!" down in a terminal velocity dive, heading for the safety of the lower valley mists. The heavier police ship, with its higher wing-loading, could not match the maneuver. The rebel craft plunged down through the blinding fog. Half-seen, ghostly fingers of stone clutched up at them, Phew! " Brian gasped. "Well, we got away that time. How in thunder of the mountain face. Brian yelped and cowered instinctively back. The spotted for sure, now." The other rebels waited uncertainly, but not for long. There was the crescendoing roar of ships in a dive followed by the terrific crash of an explosion. "We've got to slow them down some way, then. I wonder how the devil they traced us? I thought we lost them in that fog." "It's that Serono Zeburzac, the traitor. He knows these mountains as well as we do." "How come?" "We might as well just wait," Crystal said hopelessly. "It won't do us any good to run out into the hills. Zeburzac and his men will follow." "We could slow them down some by swinging a couple of those ships around so their rocket exhausts sweep the entrance to the cavern," Brian suggested doubtfully. She looked at him steadily. "You sound like the only good rebel left. We can try it, anyway." They ran two ships out into the middle of the cavern, gunned them around and jockeyed them into position—not a moment too soon. concealment. Then Brian and Crystal cut loose with the drives of the two ships. the police, their clothes and flesh scorched and flaming, plunged as shrieking, living torches down the mountainside. verging on extinction. He dashed to the other ship and repeated the Brian clambered out of the ship and glanced at the glowing points "It's time to check out," Brian shouted. "Run!" Brian shoved her and they plunged madly through the thick tangle vegetation. The remains of two police ships, caught without warning in the rush as Brian and Crystal struggled painfully to solid ground. Crystal gazed "How did you do it?" "It's a matter of harmonics," Brian explained. "If you hit the right "Where are we heading for?" Brian grunted as he struggled along. can depend on. They've kept out of the rebellion, but they're on our side. They've helped us before."

<question>:
What lesson did Brian learn from his experience?

<options>:
A That Serono Zeburzac was a rebel insider.
B That Venus Consolidated served the best interests of the planet.
C That the Venus Consolidated police weren’t honest.
D That the rebels built mines as escape routes from the police.

<answer>:

C