Which sentence would best create a strong, descriptive image in the reader’s mind if it were added after sentence 4? he was casting quick, sideways glances in the direction the bus should be coming from, and his left foot beat a steady rhythm on the hot pavement. all of the man’s actions and mannerisms clearly indicated his distress, and i could not staring at him while we waited for the bus to finally arrive. the man’s behaviors led me to guess that he was anxious about something, and i wondered if the tardy bus could have caused such upset in someone. in fact, he appeared to be so aggravated that i thought for a second that he would explode with anger, but then he just sat down and silently waited.

The answer is C.  "the man's behavour led me to guess...upset in someone."

 Sentences A and B describe the actions and manners, showing the man's behaviour and anxiety: casting quick glances, his foot beating on the hot pavement etc. appearing he could even explode with anger.  At some point (C), he changed and just got calm, wainting silently, leading the speaker to wonder if the cause of all this could be the bus' delay.

the cost of attendance or coa is an approximate budget for the cost of attendance of the whole academic year. in order to calculate this, universities take into consideration many factors like room and board, tuitions and fees, books, transportation and personal expenses such as medicine, laundry, clothing. all these factors combined make up the final sum to the cost of attendance in each university.