trainees vs trainers

[Zarinamo]

English Language Tests, Intermediate level

ESL/EFL Test #74 "Christmas Postman (1)", question 8

He didn't want any of his ......... to imagine that being a postman was an easy job.

(a) trainers
(b) training
(c) trainees
(d) trains

English Language Tests, Intermediate level

ESL/EFL Test #74 "Christmas Postman (1)", answer 8

He didn't want any of his trainees to imagine that being a postman was an easy job.

Correct answer: (c) trainees

Your answer was: incorrect
He didn't want any of his trainers to imagine that being a postman was an easy job.
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Why not trainers?

Zarinamo

[Mister Micawber]

.
Presumably, trainers should already know that postal delivery is difficult, so logic is against that choice.
.
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Native English teacher at Mister Micawber's