Go into a contract vs. enter into a contract?

[VioletaNicoleta]

Business English Lesson, Advanced Level

ESL/EFL Test #130 "Contracts and agreements", question 5

A customer ......... into a contract each time s/he makes a purchase.

(a) goes
(b) joins
(c) becomes
(d) enters

Business English Lesson, Advanced Level

ESL/EFL Test #130 "Contracts and agreements", answer 5

A customer enters into a contract each time s/he makes a purchase.

Correct answer: (d) enters

Your answer was: incorrect
A customer goes into a contract each time s/he makes a purchase.
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When I saw this question I was sure it's either ''enters a'' or ''goes into''
Can someone please explain?

[Mister Micawber]

The correct idiomatic phrase is 'enter into' a contract/agreement/deal/etc. 'Goes into' is not a native formation here.
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Native English teacher at Mister Micawber's