What does 'go along with' mean?

[Thunu]

Business Idiom in English, Intermediate level

ESL/EFL Test #128 "Ways of disapproving", question 6

They can't possibly go ......... with your suggestions because it will involve too much expenditure.

(a) over
(b) along
(c) in
(d) above

Business Idiom in English, Intermediate level

ESL/EFL Test #128 "Ways of disapproving", answer 6

They can't possibly go along with your suggestions because it will involve too much expenditure.

Correct answer: (b) along

Your answer was: incorrect
They can't possibly go in with your suggestions because it will involve too much expenditure.
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Hello Teachers

Why dont we use "go in with" here? What is the diference between Go in with and go along with?
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Reach an agreement as ploughing, don't let argument happen at crops.

[Mister Micawber]

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'Go in with' means 'join', which is not the intention here. 'Go along with' means 'agree to, follow'.
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Native English teacher at Mister Micawber's