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

<passage>:
group this summer?" 20% solution." "Goodness." I protested, "it's been twenty-five years since my last course in chemistry. Perhaps if I saw the now empty of its soda bottles, I had the impression during that children of a new age. "That's very nice," said Marjorie. in uniform they still look ominous group do?" were laughing and evidently enjoying themselves. and I was relieved to see that they were skinny kids, too. The three which are available for later educational expenses." "Gracious, you wouldn't have to almost nonexistent. "Oh, all right," I said, "laugh at my commercial aspirations. But don't were of an age and were all tall for And the funniest part was they kept right on coming. You couldn't imagine We've had to watch such things rather closely for the last ten—no, we are. And we just saw a demonstration of that fabulous kite and saw all those simply captivating mice." "Mice?" "Yes, of course. Who would ever have thought you could breed mice with those cute furry tails?" Well, after a while things quieted be our headquarters and factory for the summer—a roomy unused barn belonging to the parents of one of ten-year-olds. boy, selling is fun. Hilary, when can you make some more of that stuff? And Doris, how many mice do you have?" Those mice! I have always kept my enthusiasm for rodents within bounds, but I must admit they were charming little beasts, with tails as bushy as miniature squirrels. "How many generations?" I asked Doris. "Seventeen. No, eighteen, now. thought, be quite a beauty in a few I won't try to explain it as she did to me, but it was quite evident that the new mice were breeding true. Presently we asked Betty Miller to come back down to the barn for a more years, but was at the moment Want to see the genetic charts?" right, if you promise me they can't get out of their cages. But heaven knows what you'll do when fall comes. They won't live in an unheated barn and you can't bring them into the house." "We'll be out of the mouse business by then," Doris predicted. "Every pet shop in the country will have them and they'll be down to nothing apiece." Doris was right, of course, in spite of our efforts to protect the market. Anyhow that ushered in our cage building phase, and for the next week—with a few interruptions—we built cages, hundreds of them, a good many for breeding, but mostly for shipping. It was rather regrettable that, after a few months younger, was just an average, extroverted, well adjusted youngster, noisy and restless, tee-shirted page, including photographs, we rarely had a day without a few visitors. Many of them wanted to buy mice or kites, but Tommy refused to sell any mice at retail and we soon had to disappoint those who wanted kites. The Supermarket took all we had—except each. Tommy's ideas of pricing rather frightened me, but he set the value of the mice at ten dollars a pair and got it without any arguments. Our beautiful stationery arrived, these junior achievement efforts, are chemical specialties that can be made safely and that people will buy and he had said, "have exceptionally high IQ's—around one forty or one fifty. The other three are hard to classify. They have some of the much of the time they seem to have little interest in their studies. The junior achievement idea has sparked their imaginations. Maybe it'll be just what they need." might cost ten thousand dollars. Let's think of something easier." advance against next season's royalties. brand new synthetic detergent. I've got an idea for one that ought to be calling for capital investment. If we should keep the achievement group going for several summers, it might be possible later on to carry out a safe synthesis of some sort. You're despondency. "I'm not very technical. Just sort of miscellaneous. But if the group wanted to raise some mice, I'd be willing to turn over a project I've had going at home." "You could sell mice?" Tommy demanded incredulously. "Mice," I echoed, then sat back and thought about it. "Are they a pure strain? One of the recognized laboratory strains? Healthy mice of the right strain," I explained to Tommy, "might be sold to laboratories. I have every month." "No," said Doris, "these aren't laboratory mice. They're fancy ones. I got the first four pairs from a pet shop in Denver, but they're red—sort of chipmunk color, you know. I've carried them through seventeen generations of careful selection." "Well, now," I admitted, "the market for red mice might be rather limited. Why don't you consider making "What is it?" "A whisker stiffener. It makes each hair brittle enough to break off right an after-shave lotion? Denatured alcohol, do your whiskers grow back the next day?" "Right on schedule," I said. the razor industry, there's no better time to start than now." When they had driven off I turned and said, "Let's talk a while. We can always clean mouse cages later. Where's Tommy?" "Oh, he stopped at the bank to get "What on earth for? We have over six thousand in the account." "I suppose there might be people who'd prefer to use it beforehand," I conceded. and that, according to all the articles I had perused, is most important "Winter quarters," Marge repeated. "You mean you're going to try to keep the group going after school to such groups. It's standard practice starts?" through their courses without thinking about them, and actually they won't put in more than a few hours a week during the school year." "Even so, it's child labor, isn't it?" naturally. On the other hand, they pondered at some length about a "Child labor nothing. They're the "Sure," I told her. "They've offered me a small share of the company, and I'd be crazy to turn it down. After all, what's to lose?" Transcriber's Note: "I'll make one tonight," said Doris, "and think about the small end. It'll work out all right." I wished that the youngsters weren't starting out by inventing a new article to manufacture, and risking an almost certain disappointment, but to impractical, of course, for a group of children to attempt, but several of them appeared quite attractive. Hilary, reluctantly forsaking his ideas on detergents, suggested we make black plastic discs, like poker chips but thinner and as cheap as possible, to scatter on a snowy sidewalk where they would pick up extra heat from the sun and melt the to reduce evaporation. These latter ideas had made unknowing that it flew surprised me. That it flew so confoundedly well was humiliating. Four of them were at the barn when I arrived next morning end the slightest of twists. "There, it ought to swoop." volunteered—not without a hint of complacency in his voice. "It didn't take long, but they sure made it out give them a specimen signature. Oh, yes, and cosign the note." for a two-hundred-and-fifty-dollar note—over two weeks salary. I made a mental vow to sign very few checks. the kite, and the youngsters embarking on a shopping trip for paper, glue and wood splints. There was no use and presently had a regular production line under way stapling the were sold. By Wednesday of the following any until we had, as he put it, enough to meet the demand, but this quantity seemed to satisfy him. He said he would sell them the next week and

<question>:
Why will the group be out of the mouse business by the fall?

<options>:
A They are selling the mice to the Commission.
B When the cold weather comes in the fall, the mice won't survive in the cold barn.
C Tommy refused to sell the mice.
D The mice are breeding so fast, they will not be a novelty much longer.

<answer>:

D