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 tumbled rocks of Den Hoorn blastoff. There was nothing to do but turn back to Rathole and see if some other way could not be found. Jan sat in the half-buried room Jan smiled a tight smile. and enjoyed the luxury of a pipe Jan needed all his Dutch stubbornness, people whose technical knowledge was as skimpy as it obviously was in Rathole were able to build these semi-underground domes to resist the earth shocks that came Jan was at a loss to know how Heemskerk wore a spacesuit. Den Hoorn into the teeth of the and Jan bounced against his climbing aboard, closing the airlock and jolted against the rocks outside, from Den Hoorn. But this one Jan felt justifiably exasperated filled the airtight groundcar. to take the boy to Oostpoort from here, instead of calling on us to send a car, Den Hoorn could have "If some effort had been made groundcars out to search for it. This, of course, would be too late to help the patient Van Artevelde ground about him buckle and knew that preparations were being Jan mentioned this to the groundcar radio. made now to send a couple of Jan incredulously. years ago. It's about eighty kilometers to pause with his foot on the eyes returned Jan's glance. "If the disease has just started, for many months, for Jan was a member of the Dutch colony at the boy could wait for the next Earth ship, couldn't he?" No. The platform hovered and was Van Artevelde leaning over what happened? Even that Jan had just figured out a combination the Dutchman slashed at the contraption, his knights, when Dekker, the slid to the ground with a two passengers tumbled prone to radio message," said Dekker. "They've got a passenger for the Earthship over at Rathole." "Rathole?" repeated Heemskerk. "What's that? I didn't know there was another colony Jan struggled to his feet and "Jan!" boomed Heemskerk, Jan puffed at the Heerenbaai-Tabak bunch of laborers left behind when the colony folded several damned thing ought to get here from Rathole faster than that." "Had no fuel," replied Jan briefly. "My engines were all A thought occurred to him. From what he had seen and heard, the entire economy of Rathole could not support the tremendous expense of sending the boy across the millions of miles to Earth by spaceship. "Who's paying his passage?" he asked. "The Dutch Central Venus Company isn't exactly a Jan relit his pipe silently, making a mental resolution that Dekker wouldn't take care of it alone. Jan whistled softly. He had Dekker was right. "Jan, you're the best driver in Oostpoort," said Dekker. "You will have to take a groundcar to Rathole and bring the fellow back." So now Jan gripped his clay Jan grunted. the groundcar into the teeth trying to cross Den Hoorn by long day when temperatures of the surface rocks changed. On the other side of it lay Rathole, a little settlement that eked a precarious living from the Venerian vegetation. Jan never had seen it. "Too bad. There's nothing we can do, then. The nearest settlement the groundcar had trouble amid the tumbled rocks of Den Hoorn. body of the groundcar was suspended work, and one was left behind—probably with a little help from the people of the settlement. But...." "What kind of machine? Copter shaken Den Hoorn since he had constant danger of its being flipped dropped several meters by past The groundcar zig-zagged Jan. "But you know I'll do it." Jan reached the edge of a and came to them. As Jan arose, Den Hoorn could be crossed by he swung the groundcar northward Jan disengaged himself gently, Rathole. His pipe was out, but he could not take his hands from the wheel to refill it. of an old quake. He found a spot where rocks had tumbled down, fuel for the flying platform." The platform was in a warehouse which, like the rest of the structures in Rathole, was a half-buried dome. The platform's ring-shaped base was less than a where he had climbed up coming The ground heaved and buckled the groundcar with ominous spotted with rust, Jan, surrounded minutes, during which Jan was Jan peered over the edge of the groundcar upright. Then, in unison, Jan made use of this calm to transmitted to it by heavy send the groundcar speeding Jan sighed. It was an unhappy rubber belts. of Den Hoorn, and he covered wind struck again, cutting his and no fuel for them. "You're sure there's no gasoline, anywhere in Rathole?" he asked Sanchez. speed down considerably. He judged he must be nearing Rathole. Sanchez smiled ruefully, as he Not long thereafter, he rounded settlement made use of the cheapest, most obviously available an outcropping of rock and it power source. It was dotted was carried back to the flat lands around 's Gravenhage. For Amid the windmills, low domes protruded from the earth, indicating that the dwellings of Rathole were, appropriately, partly underground. Jan thought that over, trying gale piled dust and sand in Jan found half a dozen He pulled the groundcar to a stop beside them, stuck his pipe for a groundcar, except for the chasm out on Den Hoorn. The groundcar! Jan straightened "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." run, carrying five-gallon cans with them. Three others picked up the Jan recoiled and dropped the platform and carried it up a ramp and outside. As soon as they on his back with outstretched Jan, his head just above There was flat ground to and secured it by them to the heavy chain that ran by the conmigo. " He gestured for Jan to follow overturn. Shortly the two men returned with the fuel from the groundcar, chain. Jan followed, and the Jan got above ground in a crouch, clinging to the rail of the struggling along the chain. platform, and helped them fill He went out, shutting the airlock wouldn't make it," said Jan ruefully, He turned and spoke to someone in the dome. One of the men of Rathole came to Jan's side and tried the engines. They refused to catch. The man made carburetor "He says that your groundcar "Well, as much as I'd like to stop for a pipe, we'd better start at once," said Jan. "It's a hard 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." worked, Jan stared out at the furiously spinning windmills that dotted Rathole. "There's nothing that can be done," he repeated. "We can't make the trip overland because Hoorn, and we can't fly the platform "Thanks," replied Jan. He donned Jan and Diego made their way groundcar. There was a score of Jan looked at his watch. A Jan swung the groundcar around left Oostpoort, and the afternoon wind behind him, and Jan hit a Jan was sorry. He had done his rougher ground of Den Hoorn. The boy was not in the dome. He was outside, crouched in the lee The ground of Den Hoorn was still shivering. Jan did not realize sticks. groundcar almost to a stop at one Diego must know of his ailment, and why he had to go to Oostpoort. If Jan was any judge this until he had to brake the The ground far ahead of him watching for the cliff he had to off for Earth, Jan did not know. Jan felt ashamed of the exuberant groundcar would have stood on he could do something. Outside, the windmills of Rathole Jan wheeled the groundcar Rathole, power in the air all around them. If he could only use it! But to turn the platform on

<question>:
Why was Jan in the groundcar diving across Den Hoorn?

<options>:
A To retrieve a medical patient
B To flee the storm that was hitting the main station
C To refill his fuel
D To bring supplies to the settlement of Rathole

<answer>:

A