I'm with you all the way

[Abhishek]

Test No. incompl/inter-39 "Yes, Yes, Yes", question 3

No matter what happens, you must remember that I'm ......... you all the way.

(a) in
(b) from
(c) with
(d) by

Test No. incompl/inter-39 "Yes, Yes, Yes", answer 3

No matter what happens, you must remember that I'm with you all the way.

Correct answer: (c) with

Your answer was: incorrect
No matter what happens, you must remember that I'm by you all the way.
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Why is "by you all the way" correct ? please explain the difference b/w the two.

[Mister Micawber]

.
By you is not correct. With you is the idiom. A related idiomatic expression is by your side.
.
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Native English teacher at Mister Micawber's

[Alan]

Hi,

This expression means I fully support you in everything you do. The simple expression I'm with you means I support you/I agree with you. Remember the expression by the way means incidentally as in:

By the way,have you heard the latest news about the railway strike?

In conversation as above by the way introduces a new topic in a conversation.
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English as a Second Language
You can read my ESL story Subjunctive