Which data set represents the histogram?
a) {56, 66, 71, 78, 53, 73, 69, 68, 70, 60, 59, 55}
b) {57, 66, 76, 78, 57, 53, 69, 68, 71, 68, 59, 55}
c) {56, 66, 71, 78, 57, 53, 69, 68, 70, 60, 59, 55}
d) {61, 61, 71, 78, 57, 53, 69, 68, 70, 76, 59, 55}