Question

Which answer is the sentence fragment?
a. The clouds in the sky this morning.
b. My parents insisted that we wear sunscreen.
c. We went hiking along a segment of the Appalachian Trail.
d. It was a perfect day for going on a long hike.

Answer 1

Sentence fragments are incomplete sentences. 

"The clouds in the sky this morning." doesn't sound like a complete sentence so therefore that is the sentence fragment (a).

Answer 2

Answer:  A, the clouds in the sky this morning.

Explanation:  This is not a complete thought or sentence so it is a sentence fragment.