Read the sentence carefully to determine if there is any grammatical or idiomatic error in it. The error, if present, will be in one part of the sentence. Select the letter corresponding to that part as your answer. If the sentence is free from errors, select 'No error' as your response. (Ignore punctuation errors, if any).

If she has submitted the proposal on time, (A)/ the committee would have approved (B)/ the budget required (C)/ to start the project. (D)

The correct option is A.

Detailed Explanation:
The given sentence represents a third conditional construction, which is used to talk about hypothetical past situations and their imaginary outcomes in the past.

The standard grammatical structure for third conditional sentences is:
• If-clause: If + Past Perfect tense (had + past participle)
• Main clause: would have + past participle

In part (B), the main clause uses "would have approved". Consequently, the if-clause in part (A) must be in the past perfect tense ("had submitted") rather than the present perfect tense ("has submitted").

Corrected Sentence:
"If she had submitted the proposal on time, the committee would have approved the budget required to start the project."