Answer:
D. by adding "Specifically" to the beginning of the sentence
Explanation:
Sentence 2 states: They are suffering various effects of sleep deprivation.
Sentence 3 elaborates on specific effects of sleep deprivation that the teens are suffering from.
Fact A is found in passage 2
Set is the wrong word used incorrectly
From what I've understood from the excerpt, the author wants to portray Elizabeth Van Lew's undercover attitude and skills in order to gather intelligence. In order for her to get inside the premises and spy, she must maintain a good act in order for the guards not to be suspicious. Therefore, the answer is A.