Only the underlined part may change. An option that alters anything outside it is wrong however well it reads.

Sentence improvement is a substitution test on one phrase. The rest of the sentence is fixed context, and an option that changes it is answering a question that was not asked.

He is averse TO ANY CHANGE in the procedure. → no improvement

the underlined phrase is already idiomatic

He does not like changes in the procedure at all.

the whole sentence rewritten

Where it bites

Options that read more naturally than the original because they have rewritten more of it. Compare each option against the underlined portion only.