Answer:
B. A simple sentence
Explanation:
An independent clause (or main clause) is a clause that can stand by itself, also known as a simple sentence.
A single clause that stands by itself is a (B) A simple sentence.
A single clause is also known as an independent clause (or a main clause) which can stand on its own and has a separate meaning as a simple sentence. An independent clause, the single clause contains a subject and a predicate and makes complete sense by itself.
Example of of an independent clause/ single clause-
Therefore, A single clause that stands by itself is a (B) A simple sentence.
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