Final answer:
The sentence in question is a complete sentence as it includes a subject, verb, and expresses a complete thought, so the answer is 'a. Correct'.
Step-by-step explanation:
The sentence "The man is in the store and he does not know what he wants to eat for dinner." is a complete sentence because it contains a subject, verb, and expresses a complete thought. Therefore, the correct answer to the question is 'a. Correct'. Unintentional sentence fragments commonly appear after a complete sentence and fail to express a complete thought on their own. For example, in the provided sentence, 'd. A construction worker is laid off and takes a job at a fast food restaurant temporarily, although he has never had an interest in preparing food before.', the sentence is complete and not a fragment because it has a subject ('A construction worker'), verbs ('is laid off' and 'takes'), and it conveys a full idea.