Group the given figures into three classes on the basis of their identical properties using each figure only once.
A1, 4, 6; 2, 5, 9; 3, 7, 8
B1, 7, 8; 2, 4, 6; 3, 5, 9
C1, 6, 9; 2, 4, 5; 3, 7, 8
D1, 5, 9; 2, 4, 6; 3, 7, 8
im thinking a and d is the answer but they are telling that its d.