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 stubbornest Dutchman on Venus. JAN WILLEM van Artevelde Jan smiled a tight smile. Jan sat in the half-buried room claimed descent from William of Orange. He had no genealogy found. him, Dr. Sanchez sat with crossed legs, cleaning his fingernails with a scalpel. Diego's mother talked to the boy in low, liquid tones in a corner of the room. Jan needed all his Dutch stubbornness, and a good deal of pure Jan was at a loss to know how physical strength besides, to maneuver the clay bit grates on less stubborn teeth. people whose technical knowledge was as skimpy as it obviously and jolted against the rocks outside, and Jan bounced against his seat belt, wrestled the steering wheel and puffed at his that was all. Jan felt justifiably exasperated at these Spanish-speaking people. "If some effort had been made west. The huge wheels twisted again. This time he was really heaved about. Jan mentioned this to the his friend. The two of them had groundcar radio. enjoyed chess and good beer together Jan incredulously. some other way could not be "Don't worry," said Jan. "I'll in Diego, the wind was coming "Mmm," grunted Jan. He blonde head was bent over the boy protectingly, and over his mother's shoulder Diego's black eyes returned Jan's glance. would be their last chess game for many months, for Jan was a member of the Dutch colony at of the stubby gravity-boat. It Oostpoort in the northern hemisphere asked Jan. "If the disease has just started, the boy could wait for the smoked a clay pipe, which only a "Tell them to take the engines only when the two planets are at Dutchman can do properly, because filled with some of Theodorus "I said I had just diagnosed it, "Yes, I have," replied Jan in a out," he said. "Since we have no low voice. He had seen two people die of it, and it had not been Jan had just figured out a combination by which he hoped to two passengers tumbled prone to the ground. "Jan!" boomed Heemskerk, forcing his voice through the helmet diaphragm and rushing over to his friend. "I was afraid you were lost!" Jan struggled to his feet and "you must realize that Diego cannot leaned down to help the boy up. wait for a later ship, if his Jan puffed at the Heerenbaai-Tabak was aptly named. It was a ratty community. The boy was a dark-skinned little Spaniard—of Mexican "Had no fuel," replied Jan a boy, and a human being. origin, perhaps. But he was A thought occurred to him. Sanchez. "Certainly," replied Jan with Jan relit his pipe silently, making a mental resolution that Dekker Heemskerk. "That?" Jan whistled softly. He had at Oostpoort would contribute readily to such a cause. "Who is Diego's father?" he asked. "He was Ramón Murillo, a very good mechanic," answered Sanchez, with a sliding sidelong glance at Jan's face. "He has been dead for three years." So now Jan gripped his clay Dekker was right. "Jan, you're the best driver in Jan grunted. pipe between his teeth and piloted the groundcar into the teeth back." seen the effects of that disease. wouldn't take care of it alone. Jan. "But you know I'll do it." Sanchez looked into his face, smiling faintly and a little sadly. Jan reached the edge of a spoke in Spanish to Mrs. Murillo. The woman rose to her feet and came to them. As Jan arose, she looked up at him, tears in her eyes. and kissed them. Jan disengaged himself gently, embarrassed. But it occurred to him, looking down on the bowed wind behind him, and Jan hit a The machine was dusty and spotted with rust, Jan, surrounded by Sanchez, Diego and a dozen men, inspected it thoughtfully. on it unrelentingly. The quake lasted for several minutes, during which Jan was able to make no progress at all Jan peered over the edge of the both earthquake and wind died to absolute quiescence. Jan made use of this calm to step down on the accelerator and send the groundcar speeding Jan sighed. It was an unhappy situation. As far as he could determine, without making tests, asked Sanchez. Sanchez smiled ruefully, as he had once before, at Jan's appellation this until he had to brake the señor back to Jan. "The Americans, of ," he said, turning Jan thought that over, trying to find a way. "No, it wouldn't work," he Jan found half a dozen The ground far ahead of him Jan Willem van Artevelde his hand. ," said the man. Jan recoiled and dropped the man's hand. All the Orangeman blood he claimed protested in and enjoyed the luxury of a pipe Jan recovered himself at once. He had been reading too much ancient history during his leisure Jan, his head just above ground level, surveyed the terrain. There was flat ground to Sanchez. conmigo. " He gestured for Jan to follow him and started off, pulling his chain. Jan followed, and the with the fuel from the groundcar, Jan got above ground in a struggling along the chain. other men fell in behind in single ," said the man who had greeted Jan, gesturing. " Él "What is the matter, ?" asked Sanchez from the dome entrance. "I don't know," replied Jan. "Maybe it's that the engines haven't been used in so long. I'm wouldn't make it," said Jan ruefully, removing his venushelmet. in the dome. One of the men of Rathole came to Jan's side and tried the engines. They refused blonde, full-lipped and beautiful, with golden hair and dark, liquid eyes. She smiled at Jan. Sanchez. to catch. The man made carburetor asked Jan, astonished. She looked must have a diesel engine," Sanchez interpreted to Jan. "Is that correct?" "Why, yes, that's true." . He says it is low-grade fuel and the platform must his meaning. She turned and called: " Diego! " A boy appeared in the door, a Jan threw up his hands and went back into the dome. "I should have known that," he have high octane gasoline." done," answered Jan. "They may Sanchez called orders to the men at the platform. While they worked, Jan stared out at the furiously spinning windmills that amigo ," said Sanchez, shaking Jan's hand again. "Thanks," replied Jan. He donned if the trip over was any indication." Jan and Diego made their way back down the chain to the groundcar. There was a score of Jan looked at his watch. A little more than two hours before Jan swung the groundcar around It was easier driving with the was getting noticeably darker. Jan was sorry. He had done his best, but Venus had beaten him. He looked around for Diego. The boy was not in the dome. He was outside, crouched in the lee of the dome, playing with some still shivering. Jan did not realize Diego must know of his ailment, and why he had to go to Oostpoort. If Jan was any judge of character, Sanchez would have told him that. Whether Diego sticks. knew it was a life-or-death matter had a strange color to it. Jan, when it blasted off for Earth, Jan did not know. But the boy was around eight years old and he was bright, and like the surface of quicksand. involved in a decision to send him all the way to Earth. Jan felt ashamed of the exuberant Diego, beside him, had sat foolishness which had led him to spout ancient history quietly so far, peering eagerly figure it out. through the windshield, not saying begun to affect his personality a word Diego said when the boy spoke to him, but he liked Diego and wished desperately he could do something. Outside, the windmills of Rathole Jan wheeled the groundcar Cursing choice Dutch profanity, the bottom.

<question>:
What is the relationship between Diego and Jan?

<options>:
A Diego is sick and Jan agrees to take him to Oostpoort.
B Diego needs Jan's help getting his aircraft to fly.
C Diego and Jan are both Dutch pilots.
D Jan is Diego's father.

<answer>:

A