In the following questions, four alternatives are given for the idiom / phrase and bold italicised in the sentence. Choose the alternative which best expresses the meaning of the idiom / phrase.

You will succeed if you follow my advice to the letter .

A. about writing letters

B. written in the letter

C. in every detail

D. very thoughtfully

Please do not use chat terms. Example: avoid using "grt" instead of "great".