Meaning of stay at your post

[Guest]

Test No. express/advan-5 "Call it a day", question 9

It only remains for me to express my admiration for all those of you who stayed at your posts.

(a) waited for your letters
(b) kept your letters
(c) remained loyal
(d) stayed waiting

Test No. express/advan-5 "Call it a day", answer 9

It only remains for me to express my admiration for all those of you who remained loyal.

Correct answer: (c) remained loyal

Your answer was: incorrect
It only remains for me to express my admiration for all those of you who stayed waiting.
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why?

[Alan]

This expression means do what you should do and not run away from your responsibility.
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English as a Second Language
You can read my ESL story Phrasal Verbs/go