Which data set could not be represented by the histogram shown? a) {8, 14, 9, 15, 18, 7, 12, 13, 7} b) {7, 13, 9, 16, 18, 7, 12, 13, 5} c) {8, 14, 9, 15, 19, 7, 12, 14, 9} d) {8, 13, 11, 15, 12, 7, 12, 13, 5}