No i think that they didnt give them anything
(A) is not the right answer because a compound sentence contains two sets of subject and verb pairs. A compound sentence is basically two simple sentences that are "compounded". (B) is not the right answer because a compound sentence can contain a comma and a conjunction or a semicolon. An example of a compound sentence with a semicolon is "I did not eat the disgusting dinner; I snuck some cereal instead". (C) is the correct answer because a compound sentence contains TWO simple sentences, not one. This rules out (D). I hope this helps!
The word the best fits the blank above is COMMITMENT. This is based on the Triarchic Theory of Love by Robert J. Sternberg. According to him, the purpose of maintaining the relationship despite having problems based on the cognitive judgment of the relationship is called commitment. Being committed means you stay no matter what any obstacle or external variable may come.