请教新东方107题

The school board has determined that it is necessary to reduce the number of teachers on the staff. Rather than deciding whcih teachers will be laid off on the basis of seniority, the school board plans to lay off the least effective teachers first.

The school board's plan assumes that

(A) there is a way of determining the effectiveness of teachers

(B) what one individual defines as effective teaching will not be defined as effective teaching by another individual

(C) those teachers who are paid the most are generally the most qualified

(D) those teachers who are paid the most are generally the most qualified

(E) some teachers will be more effective working with some students than with other students

答案为什么选C呢？题目不是说不按照资历裁员么

选A吧  蓝皮书上的答案是A啊