Which answer choice is a sentence fragment? A)
The grill sizzled when the chef placed the grilled cheese sandwiches on its
hot, oily surface.
B)
Although he was unsure whether or not he was good enough for the team,
Trey decided to try out anyway.
While Nora had never really considered herself an unhappy woman
because of her nice home and even nicer husband.
D)
Unlike other various creatures of the legend, there is real evidence for the
existence of the creature known as the Yeti.

C) While Nora had never really considered herself an unhappy woman

because of her nice home and even nicer husband.

Explanation:

There is no subject and verb. There is Nora and her considering herself this and that, but it says "While Nora", meaning that something has to come after that to contrast this statement. The word "while" is a subordinating conjunction,  so the phrase that goes along with it is a sentence fragment.

why does the crew join ahab's quest without hesitation?

gold miners!

explanation: