Is this a complete sentence, a sentence fragment, or a run-on sentence?

which spend all of their time on the ocean floor looking for food.

a.
sentence fragment

b.
run-on sentence

c.
complete sentence

Directions: in 2 - 3 paragraphs respond to mack's idea about the "interplay of life and literature" in lines 92 - 100 in " why read shakespeare". 1. explain what it means to say that finding meaning in shakespeare "is a sort of proving ground for finding beauty and meaning in life". provide reasons that support your claim. 2. explain which is more important - that literature teaches readers about life or that understanding life readers understand literature. identify examples from literature you have read. 3. summarize your view of the interplay between literature and your own lives, explaining whether you see a connection or not and why.