Which example correctly uses a subordinate clause?

We will go to the bookstore after lunch; unless you went there already.

I am planning on taking a cruise with my best friends. Whom I met in college when we lived in the same dorm.

Since I spent my summer practicing the saxophone I moved up to first chair for the upcoming school year.

When that runner puts her mind to it, she can outrun anyone in her class.

Question

Which example  correctly  uses a subordinate clause?

We will go to the bookstore after lunch; unless you went there already.



I am planning on taking a cruise with my best friends. Whom I met in college when we lived in the same dorm.



Since I spent my summer practicing the saxophone I moved up to first chair for the upcoming school year. 



When that runner puts her mind to it, she can outrun anyone in her class.

anonymous · Answer

D is correct. The subordinate clause is "when that runner puts her mind to it."