The answer is not A, because it is not clear enough. Who's we?
The answer is not B, the sentence is not clear about the building they are visiting.
The answer is not C, it's not clear about what building they are talking about.
So your answer is D.
Answer: It is a simple sentence.
Explanation:
Compound sentences contain a <em>FANBOYS</em> (for, and, nor, but, or, yet, so) coordinating conjunction following a comma. Since this sentence does not contain a <em>FANBOYS</em> conjunction after a comma, it is a simple sentence.
example compound sentence:
I was hungry, so I made myself a sandwich.
example simple sentence:
I made myself a sandwich because I was hungry.
Answer:
It's is a contraction and should be used where a sentence would normally read "it is." The apostrophe indicates that part of a word has been removed. Its with no apostrophe, on the other hand, is the possessive word, like "his" and "her," for nouns without gender.