Answer:
The correct answer is the option: Compound.
Step-by-step explanation:
To begin with, the sentences that are compound are understood to be the ones who have at least two or more independent clauses that are joined together by a comma, semicolon or by a conjunction. Therefore that the sentence presented in the text corresponds to a compound sentence due to the fact that you can find two different clauses that are joined together by a comma and a coordinator in this case ("but") and when that happens that coordinator adds also flowness to the sentence.