Question

Which is a sentence fragment?

A.
This morning the sunrise was spectacular.

B.
We bought milk, bread, and eggs.

C.
A pencil, four sheets of paper, and a ruler.

D.
She asked me to, so I did.

Answer 1

C, youre listing stuff, you need to say before hand "i need" to make it a sentence. 

Answer 2

C. A pencil, four sheets of paper, and a ruler.

A sentence fragment is one that doesn't contain an independent clause, thus the sentence cannot stand on its own. C is the choice that sounds like it needs another clause to be complete, that shows that it is the correct answer.