Which statement is an example of a compound sentence?

 The statement that is an example of a compound sentence is C. I'm trying to learn Spanish, and my friend's trying to learn French.

Explanation: A compound sentence is a sentence made up of two or more independent clauses that are joined by means of a coordinating conjunction or a semicolon. An independent clause is a clause that expresses a complete thought; therefore, it can stand alone as a sentence. C. is an example of a compound sentence because it includes two independent clauses ("I'm trying to learn Spanish" and "My friend's trying to learn French"). Moreover, both clauses have been joined by means of the coordinating conjunction "and".