Answer:
C. Complex
Explanation:
A complex sentence is a sentence that consists of one independent and at least one dependent clause.
An independent clause is a clause that can stand alone as a sentence. This means that it contains all elements a sentence should contain (a subject and predicate) and expresses a complete thought.
Unlike independent clauses, dependent clauses can't stand alone. They often contain both the subject and predicate but don't express a complete thought. Their purpose is to provide us with additional information about what is happening in the main clause.
The given sentence consists of two clauses:
Since it consists of one independent and one dependent clause, this sentence is complex.