单选题 阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。
B　　Ron was an engineer.He planned a change and divied the new job of teaching kids how to swim.Ron’s easy manner soon made him a full-time employee at the swim school.
Now, the 40 hours he works a week takes in weekends, early mornings and late afternoons.He earned around 25% less than he did in engineering.But, at 49, he says he has never been happier.“I’ve had a drop in pay, but I’ve cut back on spending, too.I seldom drive to work so don’t have to pay as much for pedivol（汽油）.I don’t drink as much.I go walking in my lunch break and I’ve lost 20 kilos.I love going to work.The whole family is a lot happier.”
When one of his brothers called, offering to help him find “a real job”, he answered, “I don’t care.I know what I’m doing is good.”
He admits it was fearful making such a big change when there was the mortgage（分期付款）to pay and kids to clothe and feed, but in the end he feels it is a simple choice.“If you’re in a job you don’t like, get out.Money’s not everything.If you don’t like it, change－find something you’re going to be happy with.”What is Ron’s new job like?（　　）