Answer:
B. 2.
Step-by-step explanation:
Among the three sentences given, the one similarity between them will be the use of the word "awhile" or "a while". The main difference between the two is that "awhile" is an adverb while the other is a noun, both about "a period of time".
So, the correct use of the word in a sentence is sentence 2. Here, the word "a while" is used to talk of a specific time period. The words "awhile" used in the other two sentences should be written as "a while" if they are to be correct.
Thus, the correct answer is option B.