General Studies · Seating Arrangement & Puzzles

Read the information carefully and answer the question: In a class, there are seven students A, B, C, D, E, F, and G (including boys and girls). They sit on three benches I, II, and III such that at least two students sit on each bench and there is at least one girl on each bench. C, who is a girl student, does not sit with A, E, and D. F, who is a boy student, sits with only B. A sits on bench I with his best friends. G sits on bench III. E is the brother of C. How many girls are there among these 7 students?