Agraph uses the following intervals of 6-12, 13-19,20-26, 27-33, 34-40 to describe which set of data? a: 40, 37, 33, 32, 29, 28. 28, 23, 22, 22, 22, 21, 21, 21, 20, 20, 19, 19, 18, 18, 18, 18, 16, 15, 14, 14, 14, 12, 12, 9,6 b: 25, 25, 22, 22, 19, 19, 18, 18, 18, 18, 16, 15, 14, 14, 14, 12, 12, 9,6 c: 30, 30, 30, 30, 29, 28, 28, 23, 22, 22, 22, 21, 21, 21, 20, 19, 19, 19, 18, 18, 18, 18, 16, 15, 14, 14, 14, 12, 12, 9,6 d: 55, 43, 33, 32, 29, 28, 28, 23, 22, 22, 22, 21, 21, 21, 21, 20, 19, 19, 18, 18, 18, 18, 16, 15, 14, 14, 14, 12, 12, 9,2