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

<passage>:
you get a can opener! "Feetch!" grated Ogden Piltdon, president of the Piltdon Opener Company, slamming the drafting board with his hairy fist, "I want results!" Heads lifted over boards. Kalvin Feetch shrunk visibly. savagely. "The Piltdon Can-Opener is trailing the competition. Advertising and Sales are breaking their necks. It's Engineering that's missing the boat!" "But Mr. Piltdon," remonstrated Feetch unsteadily under his employer's "For two years there hasn't been one lousy improvement in the Piltdon Can-Opener!" roared Mr. Piltdon. "Look at our competitors. The "But Mr. Piltdon—" Sweet Home in chimes. Our own Piltdon opener barely manages to open a can in eight point nine without chimes. Is this what I'm paying you for?" Feetch adjusted his spectacles with shaking hands. "But Mr. Piltdon, our opener still has stability, solidity. It is built to last. It has dignity...." "Dignity," pronounced Piltdon, "is for museums. Four months, Feetch! In four months I want a new can-opener that will be faster, lighter, stronger, flashier and more musical than any other on the market. I want it completely developed, engineered and tooled-up, ready for production. Otherwise, Feetch—" up with production and maintenance. If you would let me put on a few draftsmen and...." "Excuses," sneered Mr. Piltdon. "Your staff is more than adequate. no more!" Piltdon trudged out of the room, leaving behind him an Piltdon Opener had not given him that opportunity. Twenty-five years! beginning to wonder if the answer is in the hand mechanical type at all." "Got to be," answered Feetch tiredly. "We must work along classical can-opener lines. Departures, such as the thermal or motor-driven Three new models and a group of cans were waiting for them on the bench. They began testing, Hanson operating the openers and Feetch clocking. "Four point four," announced Feetch after the last test. "Good, but not good enough. Too bulky. Appearance unsatisfactory. Chimes tinny. We've made progress, but we've a long way to go." ratios would give the required velocity, but there were too many other factors that negated this direct approach. The mechanism had to be compact and streamlined. Gear sizes had to be kept down. Can-top resistance, internal resistance, cutting tooth performance, handle size and moment, the minimum strength of a woman's hand were some of the variables that had to be balanced within rigid limits. Sector Twenty-five years of your life you put in with Piltdon, and he'd fire you just like that if you don't do the impossible. The Piltdon Company would have liked a little recognition. Piltdon is a household word, Hanson's bull-dog features drew into a scowl. "Piltdon ought to be rayed," he growled. "O.K., Chief. Eleven experimental models designed to date. Two more on the boards. Nine completed and tested, two in work. Best performance, four point four, but model otherwise unsatisfactory." machinist departed and Hanson locked the opener on a can. "I hope——" The can itself had disappeared. "There must be some explanation. I designed this opener with sixteen degree, twenty-two minute pressure angle modified involute gear teeth, seven degree, nineteen minute front clearance cutter angle and thirty-six degree, twelve minute back rake angle. I expected that such departures from the norm might achieve unconventional performance, but this—Dear, dear. Where do the cans go, I wonder?" understand. What forces have we uncovered here? Where do the cans go? "I'll risk that. Not a word to Piltdon." Several days later, however, Piltdon himself charged into the drawing he exulted, "will make can-opener history. Instantaneous opening! Automatic disposal! Wait until Advertising and Sales get hold of this! We'll throttle our competitors! The Piltdon Super-Opener we'll call it." Piltdon stared at his chief engineer sharply. "What's the matter, type can-opener, sir. A whole new field of physics. New principles. don't give a damn where the cans go. May I remind you that under our you holding it back. We're going into production immediately." Close, thought Feetch, wearily. It had been a man-killing job, and it The first tentative shipments of Piltdon Super-Openers had gone to climbed to hundreds of thousands per day. Piltdon Opener went into sales to one to a customer. Piltdon cancelled his advertising program. fame of the opener so that advertising was unnecessary. Piltdon, genial these days with success and acclaim, roared at Feetch: "Thank you, Mr. Piltdon." And still, thought Feetch wryly, he received nights at home investigating what had been named the Piltdon Effect. "Are you still worrying about that?" Piltdon roared jovially. "Leave the Piltdon Super-Opener. precipitation and estimated that if all the cans opened by Piltdon accused Piltdon of deliberately hoaxing the public for his own gain. A the Super-Opener. Now, get out!" discovery of a way to prevent the cans from coming back?" "A small design improvement sir, and the cans would disappear forever." "You're positive, Feetch?" Piltdon's eyes glared into Feetch's. "That's true," said Piltdon. His eyes grew dreamy. "It can be done," he mused. "The New Type Super-Opener. Free exchanges for the old. Cash guarantee that empty cans will never bother you. Take a licking Feetch felt himself sag inwardly. "Mr. Piltdon," he said. "I'm asking especially on the Piltdon effect. Hire a couple of extra men to help "Damn it, no!" roared Piltdon. "How many times must I tell you? You got your job back, didn't you?" The prospect of long years of heavy production schedules, restricted engineering and tight supervision suddenly made Kalvin Feetch feel very tired. Research, he thought. Development. What he had always "But see here, the New Type Super-Opener...!" another job. Although the cans had stopped falling on the fifteenth Piltdon, Feetch thought, feeling a strange sensation deep within his slow anger, Piltdon was hitting low and getting away with it. to Piltdon under the one year clause in the company patent agreement. No, Feetch told himself, he was revealing nothing that Piltdon might "I'll go up another ten dollars," grated the little Piltdon image. "Thanks to you. Mr. Piltdon, I wouldn't work for you if—" change all that, Feetch? We'll put out the New Type Super-Opener and Piltdon Opener will soon be forced to close down, throwing all your Piltdon eyed him sharply, then smiled with a hint of triumph. "Think it figured the Super-Opener can solve this." "Piltdon!" he barked. "Three p.m. tomorrow. My place. Be here. That's one condition is met by Mr. Piltdon." He stared at Piltdon. "In short, I want fifty-one per cent of the stock of Piltdon Opener." "Gentlemen!" squawked Piltdon, "I appeal to you—" Piltdon threw the paper to the floor and screamed: "Gentlemen, will you fair shake." "This information is important to science," said the Van Terrel man. resented the intrusion of the cans, developed a method of disrupting Type Super-Opener is designed to pass cans through the Beta screen. "Piltdon, don't bother me about production. Production is your problem." Piltdon blanched and left.

<question>:
Which is *not* a can-opener feature that Ogden Piltdon cares about?

<options>:
A Lightweight
B Musical
C Speed
D Stability

<answer>:

D