Idiom: I'm all for it!

[Shanthi]

Test No. express/advan-7 "English Grammar Prepositions", question 8

You should know that I'm all for it.

(a) completely taken with
(b) wholly interested in
(c) in complete agreement with
(d) in complete satisfaction with

Test No. express/advan-7 "English Grammar Prepositions", answer 8

You should know that I'm in complete agreement with it.

Correct answer: (c) in complete agreement with
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You should know that I am all for it.

[Mister Micawber]

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There is no need to expand the contractions for us, Shanthi.
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Native English teacher at Mister Micawber's