Directions: Read the sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The corresponding letter of that part is the answer. If the given sentence is correct as it is, select 'No error'.

Account holders can eliminate annual service fees (A)/ by applying (B)/ for a primary checking account (C)/ to the regional financial institution (D).

The correct option is D.

Explanation:
The error lies in part (D) of the sentence due to incorrect prepositional usage.

Detailed Analysis:
• In English grammar, when mentioning an account or service, one applies for an account with or at a bank or institution (e.g., "apply for an account with the bank"). Alternatively, the structure "apply to [institution] for [service]" can be used.
• In the given sentence, part (D) uses the preposition "to" immediately after specifying the account in part (C) ("for a primary checking account to..."), which is idiomatically incorrect.
• To correct the error, the preposition "to" should be replaced with "with" or "at".

Corrected Sentence:
"Account holders can eliminate annual service fees (A) / by applying (B) / for a primary checking account (C) / with the regional financial institution (D)."