Henry divided his socks into five equal groups. Let s represent the total number of socks. Which expression and solution represent the number of socks in each group if S=20? A.S/5; when S=20, the number of socks in each group is 4.B. S/5; when S=20, the number of socks in each group is 15.C. s-5 ; when S=20, the number of socks in each group is 4.D. s-5; when S=20, the number of socks in each group is 15.