Take a look at the pair of sentences, and then look at the combined sentence. Identify what was changed to form the new sentence.

I visited the zoo. My first stop was the tiger habitat.

When I visited the zoo, my first stop was the tiger habitat.

A.
combined two independent clauses with a comma and coordinating conjunction

B.
changed one sentence to a subordinate clause

C.
combined two independent clauses with a semicolon

D.
changed one sentence to a phrase