根据男士的话Probably what decided me was that the next season, there were a number of happily returning divers who wanted me as an instructor again可知是他的学生使他决定做一名潜水教练。

【听力原文】
W: Dave, you' ve been a diving instructor for many years, teaching the new divers the basics can not be an easy job? What made you choose this usual career?
M: Well, deep sea diving was first leisure activity for me. Then the local diving center needed an instructor during the peak tourist season. I gave it a try and got the job, though the pay wasn' t much, I must say that my first experiences with students left me wondering if this was the career for me at all. Probably what decided me was that the next season, there were a number of happily returning divers who wanted me as an instructor again.
W: So what standards are expected as instuctors like you?
M: Well, instructors set off in boats with their students to find a good spot to dive. Now we aren' t expected to have detailed local knowledge of all the dive sites in an area. However, we are expected to fully understand the effects of strong wind and storms, because divers need flat water, that is, not many waves. When conditions are not suitable, some inexperienced instructors get upset, because their students want action, no matter what.
W: Have you ever made a serious mistake with your students?
M: Ng, training new divers is tricky, particularly if the students know more about the subject than you do. I had a couple once, Mr. and Mrs. Jones. They were doing OK, but when it came to life saving, they were not up to the right standard. I just kept saying to them, "What you are doing is OK, but it isn't not up to our standard. " When we met in the bar later, I found out they were a doctor and a nurse. I just wish the ground would open up and swallow me. I felt so stupid.
W: Do you find any part of your job boring?
M: Most definitely. Possibly number one is swimming around in a few meters of water, for my students to be able to take photos of each other to show to their friends. But apart from that, I know that students can' t be expected to get things right from the beginning and I am a patient teacher. In fact, I am glad to be doing routine things which don' t involve much action.
W: Are you planning career change?
M: I' d love to move on to a quite sort of job. Some people have suggested that I should try to get a job with a film company, taking photos and doing documentaries about ship wrecks and fish. But I feel I am not young enough for that sort of job. I' d like something where I can use the administrative skills I have. I' d like running a busy dive center, where I' d organize the work of other instructors.

当女士问男士一名教练应达到什么标准时，男士说instructors set off boats with their students Lo find a good spot to dive，而对当地地理条件的熟知也是为了找到好的潜水地点，故答案为A选项。

男士知道这对夫妻的身份之后有如下想法：I just wish the ground would open up and swallow me. I felt so stupid.可知他当时十分尴尬。

当女士问男士工作中枯燥的地方时，男士回答Possibly number one is swimming around …for my students to be able to take photos of each other to show to their friends可知留给学生时间拍照时最令人讨厌的。

最后男士说I'd like something where I can use the administrative skills I have. I'd like running a busy dive center, where I'd organize the work of other instructors.