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

<passage>:
WIND By CHARLES L. FONTENAY When you have an engine with no fuel, and fuel without an engine, and a life-and-death deadline to meet, you have a problem indeed. Unless you are Sanchez asked. "Yes," he said. "Many spare parts, but no fuel." Jan smiled a tight smile. "Tell them to take the engines spare parts for the platform," he fuel, we may as well have no engines." out," he said. "Since we have no Pieter Heemskerk stood by the Jan was at a loss to know how Jan needed all his Dutch stubbornness, these semi-underground domes to resist the earth shocks that came and Jan bounced against his Jan felt justifiably exasperated . The filled the airtight groundcar. There came a new swaying mild aroma of Heerenbaai-Tabak groundcars out to search for it. This, of course, would be too late to help the patient Van Artevelde ground about him buckle and here. We have no engines except said. "Some of those legs it groundcar radio. "That's the third time in half are powered by the windmills. We do not have gasoline engines for vehicles, so our vehicles are operated by hand." an hour," he commented. "The stands on, transmission belts, Jan mentioned this to the and our utilities. They the pump-cars that once were used on terrestrial railroads? Ours are powered like that, but we cannot operate them when the spare propellers." señor ," corrected Sanchez. "As you know, the trip to Earth takes 145 days and it can be started He pulled the groundcar to a stop beside them, stuck his pipe Jan had just figured out a combination "Jan!" boomed Heemskerk, Jan struggled to his feet and Jan puffed at the Heerenbaai-Tabak damned thing ought to get here from Rathole faster than that." "Had no fuel," replied Jan briefly. "My engines were all right, but I had no power to run them. So I had to pull the engines and rig up a power source." in their plastic shrouds. They expense of sending the boy across the millions of miles to Earth by spaceship. "Who's paying his passage?" he asked. "The Dutch Central has to blast off in thirty hours to catch Earth at the right orbital spot, and the G-boat has to blast off in ten hours to catch the transmission belts. "Power source?" repeated Heemskerk. "That?" Jan relit his pipe silently, making said Dekker. "He needs to be evacuated to Earth immediately. "This passenger can't wait," Jan whistled softly. He had base, hung a series of tattered Oostpoort," said Dekker. "You will have to take a groundcar to Rathole and bring the fellow back." So now Jan gripped his clay pipe between his teeth and piloted the groundcar into the teeth of the Twilight Gale. land. But if you have any sort of aircraft here, it might make it downwind—if it isn't wrecked on rough road through the ravines. But even the 2½-meter wheels of the groundcar had trouble amid body of the groundcar was suspended from the axles, there was constant danger of its being flipped from the people of the settlement. But...." "What kind of machine? Copter or plane?" "They call it a flying platform. It carries two men, I believe. dropped several meters by past quakes. The groundcar zig-zagged slowly westward. The tattered heave for a second or two before Jan. "But you know I'll do it." Jan reached the edge of a from the wheel to refill it. He had driven at least eight kilometers before he realized the stationary generators that Murillo to know what a brave man you are. But have you forgotten that we have no gasoline engines here? There is no fuel for the flying platform." The platform was in a warehouse which, like the rest of the give us current for our air-conditioning engines sat on each side of this the groundcar with ominous a third side was the fuel tank. The passengers entered it on the force. The car staggered forward on its giant wheels like a railed circle and between them on fourth side. groundcar upright. Then, in unison, both earthquake and wind appeared in good shape. Each Jan made use of this calm to was powered by one of the engines, transmitted to it by heavy rubber belts. send the groundcar speeding forward. The terrain was easier step down on the accelerator and Two perfectly good engines, and no fuel for them. "You're sure there's no gasoline, anywhere in Rathole?" he asked Sanchez. the engines were in perfect condition. here, nearing the western edge they were here, but the few things we take to Oostpoort to trade could not buy precious gasoline. We have electricity in plenty if you can power the platform with it." Jan thought that over, trying "No, it wouldn't work," he underground. the platform and electric motors to turn the propellers. But batteries big enough to power it all He drove into the place. There said. "We could rig batteries on them off the ground. If there were some way to carry a power line all the way to Oostpoort, or to broadcast the power to it.... But it's a light-load machine, and must have an engine that gives it the necessary power from very little weight." Jan found half a dozen died to absolute quiescence. of land, he could rig up a sail. He could still rig up a sail, for a groundcar, except for the chasm out on Den Hoorn. The groundcar! Jan straightened and snapped his fingers. "Doctor!" he explained. "Send a couple of men to drain the rest of the fuel from my groundcar. And let's get this platform above ground and tie it down until we can get it started." Sanchez gave rapid orders in Spanish. Two of the men left at a run, carrying five-gallon cans with them. Three others picked up the Jan recoiled and dropped the and outside. As soon as they reached ground level, the wind hit them. They dropped the platform to the ground, where it platform and carried it up a ramp Jan sighed. It was an unhappy overturn. Shortly the two men returned with the fuel from the groundcar, struggling along the chain. Jan got above ground in a crouch, clinging to the rail of the platform, and helped them fill the fuel tank with it. He primed the carburetors and spun the engines. chain. Jan followed, and the He turned the engines over its exhaust, but they did not catch. "What is the matter, of Rathole came to Jan's side and tried the engines. They refused to catch. The man made carburetor oily, and examined it. He turned and spoke to Sanchez. "He says that your groundcar must have a diesel engine," Sanchez interpreted to Jan. "Is that correct?" "Why, yes, that's true." "He says the fuel will not work then, señor . He says it is low-grade fuel and the platform must have high octane gasoline." Jan threw up his hands and went back into the dome. "There's nothing that can be done," answered Jan. "They may as well put the fuel back in my groundcar." Sanchez called orders to the men at the platform. While they worked, Jan stared out at the Hoorn, and we can't fly the platform Windmills. Again Jan could "Thanks," replied Jan. He donned groundcar. There was a score of men there now, and a few women. They let the pair go through, and waved farewell as Jan swung the groundcar around wind behind him, and Jan hit a still shivering. Jan did not realize groundcar almost to a stop at one point, because it was not shaking in severe, periodic shocks as it off for Earth, Jan did not know. involved in a decision to send him all the way to Earth. Jan felt ashamed of the exuberant groundcar would have stood on its nose had its wheels been smaller. They skidded to a stop. the bottom. Cursing choice Dutch profanity, Jan wheeled the groundcar northward and drove along the Rathole, power in the air all around them. If he could only use it! But to turn the platform on

<question>:
What did Jan end up using to power the flying platform?

<options>:
A A sail
B A broom
C A windmill
D Fuel from the ground car

<answer>:

C