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

<passage>:
acknowledged. "Combine a rest-cure with business, eh?" Raising the magazine, he began reading the advertisement. And that was when he saw the line about the robots. "—the only hotel staffed entirely with robot servants—" "Robots!" he shrilled. "You mean they've developed the things to that point? Why hasn't somebody told me? I'll have Jackson's hide! I'll disfranchise him! I'll—" Harper was enthralled. He'd staff his offices with them. Hang the proneness to error that was always deviling the most carefully trained office staffs! He'd investigate and find out the exact potentialities of these robots while here, and then go home and introduce them into one! I won't have another of those damnable robots in my room, do you hear?" No one within the confines of the huge lobby could have helped hearing. The clerk flinched visibly. "Now, Mrs. Jacobsen," he soothed. "You know the hotel is staffed entirely with robots. They're much more expensive, really, than human employees, but so much more efficient, you know. Admit it, they give excellent service, don't they, now?" Toothily he Harper smirked. "My good woman, I'm not a robot. Robots, of course, authoritatively to the clerk. "I've just arrived and want to get settled. I'm here merely for a rest-cure, no treatments. You can assign my quarters before continuing The clerk jumped. He dropped Harper's card and had to stoop for it. mere details.... Leaving his luggage to be unpacked by the robot attendant, he went up Harper opened his eyes. Two robots were bending over him. He saw that "Stop a robot?" Harper glared pityingly. "How? You can't reason with the blasted things. And as for using force—it's man against metal. You try it!" He ground his teeth together in futile rage. "And to think I had the insane notion that robots were the last word! Why, I was ready to staff my offices with the things!" The big man placed his large hands on his own capacious stomach and could use some robots. It sure ain't no job for a real live man. And in fact, there ain't many men left there. If old man Hagerty only knew it, he's about out of business." robot enter, wheeling a chair. "A wheel chair!" squeaked the victim. "I tell you, there's nothing wrong with me! Take it away! I'm only here for a rest-cure! Believe me! Take it away!" The robots ignored him. For the first time in his spectacular and The robots not only ignored Harper. They paid no attention at all to Jake Ellis, who was plucking at their metallic arms pleading, "Take me, boys. I need the treatment bad, whatever it is. I need all the of the room phone but as usual a robot voice answered sweetly, mechanically, and meaninglessly. He hung up and went miserably to bed. Something that concerned robots. But he was too exhausted to think it out. For five days now his pet robots had put him through an ordeal that made him flinch every time he thought about it. Which wasn't often, since he was almost past thinking. They plunked him into stinking Whenever they let him alone, he simply collapsed into bed and slept. There was nothing else to do anyway. They'd taken his clothes and the phone, after an announcement that he would have no more service for two After I signed up for the works and paid 'em in advance! And I can't find any way out of this section. The other two rooms are empty and the elevator hasn't got any button. The robots just have to come and get a man or he's stuck." "Stuck!" snarled Harp. "I'm never stuck! And I'm damned if I'll wait that assinine clerk was registering me. I'll bet that clerk got rattled and gave me the wrong key. I'll bet you're supposed to have this room and I'm getting your treatments. Why don't we switch rooms and see what happens?" that fancy lobby." Harper looked at his watch. "Time to go. Relax, old man. The robots will be along any minute now. If you're the only man in the room, I'm he watched the robots wheel away his equally delighted neighbor for his first treatment. Then he closed the door and began to don Jake's clothing. the elevator. Only the robots were immune to Harper Breen's progress across the huge suave lobby. elevator, he had laid a course for the desk which loomed like an island in a moss-gray lake, and now he strode manfully toward it, ignoring the oversize trousers slapping around his stocking feet. Only the robots shared his self control. The clerk was the first to recover from the collective stupor. Frantically he pushed the button that would summon the robot guard. With a gasp of relief he saw the two massive manlike machines moving "No you don't!" yelled Harper. "I want to see the manager!" Nimbly he circled the guard and leaped behind the desk. He began to throw things at the robots. Things like inkwells and typewriters and card indexes. Especially, card indexes. "Stop it!" begged the clerk. "You'll wreck the system! We'll never get it straight again! Stop it!" With one last appalled glare at the madman, the clerk picked up an electric finger and pointed it at the approaching robots. They became oddly inanimate. haven't even a card to prove it? Do you know why I have to make my way downstairs in garb that makes a laughing stock of me? Do you know why? Because that assinine clerk of yours put me in the wrong room and those damnable robots of yours then proceeded to make a prisoner of me! Me, robots!" he muttered. "As if I invented the damned things!" robots, but they haven't yet. Only we had to find it out the hard way. We—" he grimaced disgustedly—"had to pioneer in the use of robots. And it cost us so much that we can't afford to reconvert to human help. So—Operation Robot is about to bankrupt the syndicate." these robots might be useful in quite another capacity. I might even make a deal with your syndicate to take them off your hands—at a reasonable price, of course—and forget the outrages I've suffered at your establishment." Hayes leaned toward him incredulous. "You mean you want these robots willing to discuss the matter with your superiors." With hope burgeoning for the first time in weeks, Hayes lifted his head. "My dear Mr. Breen, to get rid of these pestiferous robots, I'll back you to the hilt! I'll notify the owners at once. At once, Mr. Breen! And while we wait for them, allow me to put you up as a guest of again!" Harper smirked. "Yep, I turned a neat little deal. I bought out Hagerty's Enzymes and staffed the plant with the hotel's robots. Got both of 'em dirt cheap. Both concerns going bankrupt because they didn't have sense enough to swap their workers. Feel I owe you a bit "All right?" Scribney gulped. Why, the dried-up little turnip was human after all. "All right! Yes, sir! But aren't you going to use some of those robots for office help? Aren't they efficient and all that?" Harper's smile vanished. "Don't even mention such a thing!" he yelped.

<question>:
Why was Harper able to buy the hotel's robots for such a cheap price?

<options>:
A Harper befriended the hotel manager and convinced him to sell the robots to him for cheap.
B The hotel could not find anyone other than Harper to sell the robots to.
C Harper had threatened to put the hotel out of business if they did not sell the robots to him.
D The hotel was failing, so the company was happy to get rid of the robots.

<answer>:

D