Correct option is A
The incorrect part is (A).
Detailed Analysis
- The Error: "The latest batch of applications have..."
- The Rule: This is a subject-verb agreement error involving a collective noun phrase. When a subject follows the pattern "The [Noun] of [Plural Nouns]," the verb must agree with the head noun (the first noun), not the noun closest to the verb.
- The Context: The subject is "batch," which is a singular collective noun. The phrase "of applications" is a prepositional phrase modifying the batch. Because "batch" is singular, the verb must also be singular.
- The Correction: Change "have" to "has."
- Corrected Sentence: The latest batch of applications has been reviewed...
Breakdown of Other Parts
- (B) been reviewed, and: Correct. This completes the present perfect passive construction (has been reviewed).
- (C) the acceptance letters: Correct. A plural noun phrase acting as the subject for the second clause.
- (D) are ready to be sent out: Correct. The plural verb "are" correctly agrees with "letters." "To be sent out" is a correct passive infinitive.
Grammar Guide: Collective Nouns and Prepositional Phrases
This is a common "proximity trap." Writers often mistakenly look at the plural noun right before the verb ("applications") instead of the actual subject ("batch").