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 screen to throw their , Trooper Lane hovered three thousand feet above Tammany Square. The cool cybrain surgically implanted in him was working on the problem. But Lane had no more patience. They'd Lane said, "I can do that a yet they let a crowd his hovering body this way couple times more, but it Lane is through now. He has been able to outthink police with the help of his cybrain. Now police are feeding the problem to their giant analogue computer in the sub-basement of the Court House. fall, fall. will be able to outthink Lane's cybrain, will predict Lane's Lock me up in barracks. heads. He'd bowled those city cops over like paper dolls, people out of the Square?" black dog was on Lane's back. mailed glove to his mouth and The humming paragrav-paks embedded beneath his this is Lane." shoulder blades held him "Lane, this is Trooper motionless above Newyork's Court House. Lane cursed Thirty seconds passed. Lane pressed a small stud in the ahead of time. They keep Troopers in the Armory and A voice spoke in his helmet. teach them how to fight. They rasped into Lane's ear: own city, that they'll be fighting Old cybrain, a gift from the Trooper surgeons, compliments of the city, would have Lane waited for the electronic girl from Mars is right, Lane. translucent underside of Newyork's anti-missile force-shield, the Shell. Old cybrain better be fast. Damn fast! down with blaster cannon." through his spine. Lane somersaulted. Cybrain had "I am, Lane." The voice of nerves. Lane's own mind was "Sir, I'm asking for help. I His know you're on my side." the three towers bordering on to plummet down, picking up speed. His mailed hands glittered like arrowheads out stiff dive position. He began "I'm sorry, Lane." Lane pressed the stud on as he sailed down through the flag fluttered on a staff below the window. says I can't. Says if I drop the arms and looked at him. "Do what you have to do. As far as I can see, you're the pane dissolved. Lane streamed through the window. Lane laughed. "Any of them Lane dropped lightly to the floor, inside the room, in battle-crouch. on his side." A girl screamed. Lane's "When my grandparents landed on Mars, they found the girl fold to the floor. There Lane frowned with the effort Lane, still in a crouch, chewed His head swung around and "Lane broke through the cordon below said, "The police analogue directly to the controls of the blaster cannon battery. It will outguess Lane's cybrain and injured. Tammany Hall has warned that this man is extremely Lane looked at Gerri. "How him. Lane is an insane killer. He is armed with the latest military weapons. A built-in electronic brain controls his reflexes—" "You deserve it, Lane." said Lane, and a sheathed finger "At ease with that jazz," are cautioned to keep clear of computer is now hooked into a puddle of glasstic. Lane strode to the window. dive out that window, they hovering above the towers. Lane's mailed hand snapped open a pouch at his belt. He flipped a fist-sized cube to the dangerous. Citizens floor. up in this lousy little room. Lane glanced out the window. killed, four others seriously A section of the energy globe "But you're safe in here!" and re-entered the tower about me." Lane picked up the force-bomb and handed it to her. "When I say now, press shaded the view from his window wall just below. this. Then take your hand off, check his moves ahead of window ledge. Automatically, "Worry about yourself, not Lane grinned. "Trooper Lane, of the Newyork Special across the Square when the window where the little red-white-and-green at Lane, either. They were her feet. Built, Lane saw. Which way now? Looks says fly right for the held herself straight and her Lane plunged forward. He "I don't," said Lane, unconcerned. He swooped over the balcony flag outside this window. That's the Martian flag, soldier. If you've never heard of diplomatic immunity, you'll him. There were five men took over. Lane's hand shot out, fingers vibrating. As he on the balcony—emergency! battle-crouch, the men slumped around him. Lane Years of training and cybrain Lane stood for a moment in about on the 3V. Where's the the midst of the sprawled floating up to him. Then he over there." She pointed. "See Lane. "Cybrain didn't know, Lane "Force-screen. Nothing gets past, except maybe a full-size blaster-beam. Keeps cops out. Keeps you in. You anybody Trooper Lane. Now there was Tammany Square inaugurating From Mars. I'm on a side of Lane. diplomatic mission." Newyork's new Military important?" "I told you, I'm an ambassador. gotta go by spaceship. What's "Gerri Kin. Look, Lane, Lane said, "I'm going to and my buddies, we just come Lane shook his head. "She's Lane said, "Yeah? Well, we up in the Armory. Won't pay us. Won't let us go nowhere. Lane said, "It wasn't so stupid They had cops guarding us. City cops." Lane sneered. "I Lane broke off. There was bellied out from above. It Lane could read the A loudspeaker shouted into maintained—that the deadliest Lane, or we'll blast you out." "You can't," Lane called. "I repeat, Lane—come out sir," said Lane. "That's why Lane turned to the girl. "I you back for that kiss." millions of miles away, and you're right across the Square "Yeah, but—" Lane shook "No deal, Lane. We're coming in." The police boats Lane looked down at the filtering down through Newyork's voices rose from below. Lane rolling to a stop around the edges of the crowd. The people Lane looked across the tower opposite, the ones he rolled up from the Square, reechoing against the tower walls. "Lane is holding the Martian Ambassador, Gerri Kin, hostage. You can see the Martian tricolor behind his force-globe. Police are bringing up blaster cannon. Lane's defense similar to the one which protects Newyork from aerial attack." Lane grinned back at Gerri like this probably cared a lot Maybe he could do it now. Cybrain said no. It said the second he dropped his force-screen, burns out the force-globe. Lane looked sadly at her. be so near getting killed when quick," said Lane. "I'm Lane you? I'll bet you're perfect with those weapons." "Listen. They been training the machinery. Troopers fight because they're not trained to "The Fans," said Lane. kept in the Armory, Lane? I "Because they're afraid of airborne infantrymen!" Lane said, "They told us in safe from bombs. They learned to be self-sufficient under of security, when you infiltrated in the city when you them so much that they'll let a few feet away, dazed, groping on hands and knees. Lane jumped to the window, looked quickly, sprang back. Cybrain pumped orders to his nervous system. "Blaster cannon," he said. "But just one. Gotcha, cybrain. I can beat that." He picked up the black box that generated his protective screen. Snapping it open with Again Lane and Gerri were Lane laughed boyishly and the crowd below. The around the open space sprawled dozens of tiny black figures, not moving.

<question>:
How is Lane able to hover over the buildings?

<options>:
A He has anti-gravity boots.
B He is in a helicopter.
C He has a jet pack.
D He has anti-gravity devices implanted in his body.

<answer>:

D