He was nervous , and she could tell he was n't used to this sort of thing . She kept very still and tried not to alarm him . The young man glanced away for a moment , over his shoulder where Brigg lay on the floor on his side , barely moving . It was n't a long enough lapse to take advantage of , though .

a. He was alarmed by the crimes she committed .; b. He was afraid to show anyone up with his knowledge .; c. He was afraid to show his date up .; d. None of the above choices .;
Answer the following question: Why was the male subject appearing to be nervous ?
d.