Final answer:
A grammar checker is a digital tool that produces finished or near-finished sentences by identifying and correcting grammar, spelling, and punctuation errors in a written piece. The correct answer is b.
Step-by-step explanation:
A grammar checker is a software program that helps identify and correct grammar, spelling, and punctuation errors in a written piece.
It provides suggestions and recommendations to improve the clarity and correctness of sentences. For example, grammar checkers can detect and correct sentence fragments, verb tense errors, and subject-verb agreement issues. The digital tool that produces finished or near-finished sentences is a grammar checker hence option b is correct.