Answer:
The answer is indeed letter D) The red, white, and blue shoes are perfect for the Fourth of July celebration.
Step-by-step explanation:
We were asked to find the sentence that is an independent clause. An independent clause has a subject and a predicate. It expresses a complete thought on its own. The sentence in letter D has those characteristics. It is perfectly understandable on its own, meaning it expresses a complete thought. It has a subject - "The red, white, and blue shoes" - and a predicate - "are perfect for the Fourth of July celebration."
Letter A is a sentence composed of two independent clauses connected by a semicolon. Letter B is a conditional clause, which means the clause with "if" is subordinate (dependent) to the main clause. Letter C has a conditional clause and two independent clauses. Thus, the one that best answers the question is letter D, since the whole sentence is an independent clause.