A、Because older people can’t understand the problem the young face. B、Because older people don’t want to understand the young. C

M: I was young once myself, you know. I know what it’s like to be young.
W: But you don’t know what it’s like to grow up in our world, Mr Perkins. You had a brave new world to fight for, didn’t you? But what have we got to look forward to? Pollution and the population explosion..., if we’re not destroyed first by the H-bomb!
M: We’ll survive, Susan. The young will realise the world one day. They’ll learn and grow up.
W: You think we should grow up to be like you, don’t you? You sometimes laugh at us when we talk about universal love and understanding between people! When people demonstrate about what is happening in other countries, you say, "What right do they have to interfere? It’s none of their business!" But it is our business, Mr Perkins.
M: But international demonstrations only make misunderstandings worse. A lot of you are so sure you’ve got the answer to everything. You won’t accept guidance at all from older people.
W: Mr Perkins, it’s very difficult for older people to give proper guidance these days. They didn’t have the same kind of problems. That’s what the generation gap is all about.
M: Well, I don’t think the generation gap in this country is as great as you make it out to be. In fact, I suspect you go to your mother for advice just as often as you go to friends of your own age!
W: Perhaps you are right. But, Mr Perkins, I’m almost frightened of getting older! Will I be talking like this to my children one day?
Questions 13 to 15 are based on the conversation you have just heard.
13. When does Mr Perkins laugh at the young, according to Susan?
14. Why does Susan think that older people can’t give proper guidance nowadays?
15. What is Susan’s opinion of getting older?