Answer:
Complex sentence
Explanation:
The options you were given are the following:
The given sentence is an example of a complex sentence.
A complex sentence is a sentence that consists of one independent clause and one or more dependent (subordinate) clauses.
An independent clause is a clause that can stand alone as a sentence. Every sentence must contain a subject and predicate and express a complete thought. Independent clauses fulfill these criteria while subordinate clauses don't. This is why they can't stand alone as a sentence. Their purpose is to provide additional information about what is stated in the independent clause.
The given sentence consists of two clauses:
This is why the first option is the correct one.