【正确答案】 A

【答案解析】[听力原文]
   W: Hi, Mr. Adams?
   M: Ah, Yes. You must be Kelly. Thanks for coming.
   W: Here's my card.
   M: Oh, thank you. It's really hard to find a good babysitter on Friday night.
   W: Well, I like watching kids, and I need the extra money.
   M: Well, I heard you were one of the best and most affordable babysitters in the area.
   W: Uh, well, I'd like to talk to you about my new rate increases.
   M: Rate increases?
   W: You see, Mr. Adams. I've consulted with my financial advisor, my mother. And she says I should charge more per child since I do cook and clean your house while you're away.
   M: Oh, I see. So, what do you have in mind?
   W: Well, as I see it, I'd like to ask a dollar more per child per hour, and overtime after midnight. Based on my calculations, that's only 10% above the going market, and I'm now a certified babysitter with training in CPR.
   M: Oh, I never knew there were courses and certifications in babysitting.
   W: Times are changing, Mr. Adams. I have to figure in expenses for a benefits package to cover college tuition, retirement, and my stock portfolio.
   M: Ah now, you're pulling my leg. I mean, how old are you anyway?
   W: Old enough to be a tough negotiator. I know you have two naughty boys, and you and your wife are too busy. So, think it over and call me, Mr. Adams.
   Why does the woman become a babysitter?
女士在对话中提到，她喜欢孩子也需要额外的收入，所以她愿意帮别人照看孩子，故答案为A。