Question

read the sentence.
there is a swimming pool in our backyard, but it contains no water.
this is an example of a
○ simple sentence.
○ compound sentence.
○ complex sentence.
○ compound - complex sentence.

Explanation:

A compound sentence is made up of two independent clauses joined by a coordinating conjunction (like "but" here). The sentence "There is a swimming pool in our backyard, but it contains no water" has two independent clauses ("There is a swimming pool in our backyard" and "it contains no water") connected by "but", so it's a compound sentence. A simple sentence has one independent clause, a complex sentence has one independent and at least one dependent clause, and a compound - complex has multiple independent and dependent clauses, which don't apply here.

Answer:

B. compound sentence.