GMAT Sentence Correction (SC) | Re: A patient accusing a doctor of malpractice will find it

In my view, (B) is wrong.

After searching the usage of "unless" on the internet, then I found thisexample:

"Unless she hurries up, we won't arrive in time."

You'll see that it usespresent simple tense in the unless clause, and usesfuture tense (will not) in the Then clause.

Then look at this problem, you'll see that it already uses "will" in the Then Clause. Therefore, it is not able to use future tense again in the Unless clause.

The same structure of If...Then