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

<passage>:
HAGERTY'S ENZYMES By A. L. HALEY There's a place for every man and a man for Harper tried to let go of everything. He gave in to the chair. And Harper glared at the preposterous chair. "Franz!" he snarled. "That prize fathead! I've paid him a fortune in fees. I haven't slept for weeks. I can't eat anything but soup. My nerves are jangling like Harper snorted. His large nose developed the sound magnificently. me to a crack-up. It's the strain of trying to get some sensible, reasonable coöperation from the nincompoops I have to hire! It's the idiocy of the human race that's got me whipped! It's the—" "Hey, Harp, old man!" His brother-in-law, turning the pages of the were the complete antithesis of Harper's picked-crow physique and only that." Confidentially he leaned toward his insignificant looking brother-in-law. "The chemists over at Dade McCann have just isolated an enzyme from one species of Martian fungus that breaks down crude oil into its components without the need for chemical processing. There's a fortune waiting for the man who corners that fungus market and learns to process the stuff!" Scribney had gauged his victim's mental processes accurately. The 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 The trip out did Harper a world of good. Under the influence of the copper-glass, and at the vistas of beautiful domed gardens framed by a dozen arches. But most of all, the robots won his delighted approval. He could see at once that they had been developed to an amazingly high state of perfection. How, he wondered again, had this been done without he watched the robots moving efficiently about, pushing patients in wheelchairs, carrying trays, guiding newcomers, performing janitorial duties tirelessly, promptly, and best of all, silently. Harper was enthralled. He'd staff his offices with them. Hang the expense! There'd be no more of that obnoxious personal friction and 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 robot. Harper watched him shrinking and turning pale lavender in the really, than human employees, but so much more efficient, you know. Harper one of the leading business executives of the earth. Harper's pallid smile he pressed a button and consigned Harper to the care of a windows set in the green glass wall framed startling rubicund views of the Martian hinterland where, Harper affectionately thought, fungi were busy producing enzymes that were going to be worth millions for him and his associates. There remained only the small detail of discovering how to extract them economically and to process them on this more than arid and almost airless planet. Details for his bright young laboratory men mere details.... Leaving his luggage to be unpacked by the robot attendant, he went up to the domed roof restaurant. Lunching boldly on broiled halibut with Harper's tongue finally functioned. "What's all this?" he demanded. Harper scowled. "Oh, haven't I?" he grated. "Robots! Do you know what they did to me." Indignation lit fires in his pale eyes. "Came in here while I was lying down peacefully digesting the first meal I've enjoyed in months, dragged me off to the surgery, and pumped it all out! The only meal I've enjoyed in months!" Blackly he sank his chin onto his fist and contemplated the outrage. "Stop a robot?" Harper glared pityingly. "How? You can't reason with "That's right. How'd you think I got in such a helluva shape? I'm superintendent of one of the fungus plants. I'm Jake Ellis of Hagerty's Enzymes. There's good money in it, but man, what a job! No air worth mentionin'. Temperature always freezin' or below. Pressure suits. Huts. Factory. Processed food. Nothin' else. Just nothin'. That's where they 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, ruthless career Harper was up against creatures that he could neither bribe, persuade nor browbeat, inveigle nor ignore. It shattered his The robots not only ignored Harper. They paid no attention at all to There was something nagging at Harper's mind. Something he should do. was sure. They soaked him in foul, steaming irradiated waters until he gagged. They brought him weird concoctions to eat and drink and then stood over him until he consumed them. They purged and massaged and exercised him. 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 hours on end like the proverbial baby, and that he was getting such an appetite that he could almost relish even that detestable mush they sent him for breakfast. He was determined to be furious. As soon as he Jake, looking over Harper's skimpy frame, grunted doubtfully. "Maybe Harper had guessed right. Gleefully from the doorway of his new room Only the robots were immune to Harper Breen's progress across the huge "No you don't!" yelled Harper. "I want to see the manager!" Nimbly he "Call them off!" snarled Harper. "Call them off or I'll ruin your "This—this way, sir." With shrinking steps the clerk led Harper across Hayes, the manager, blanched. Then he began to mottle in an apoplectic With a shaking hand he mopped his forehead. " My robots!" he muttered. "As if I invented the damned things!" Hayes leaned forward like a drowning man sighting a liferaft. "What Meticulously Harper clipped and lit his cigar. "It seems to me that your establishment." Hayes leaned toward him incredulous. "You mean you want these robots Placidly Harper puffed a smoke ring. "Of course, you'd have to take 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 Harper gazed out at the stunned audience. This was more like the And indeed, Harper was stepping briskly downward, looking spry and fit 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 for that tip about enzymes, Scrib, so I made out a block of stock to you. All right?" "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?"

<question>:
How did Harper satisfy his ambitions and solve Hayes' problems?

<options>:
A He traded out the factory workers for robots, and the factory workers took over the hotel jobs.
B He fired all of the factory workers and replaced them with robots.
C He purchased a controlling interest in Operation Robot.
D He harvested all the fungal enzymes for his company.

<answer>:

A