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Direction: In each of the following questions, group the given figures into three classes on the basis of their common properties using each figure only once.

A)  7. 8, 9; 2, 3, 4; 1, 5, 6                                      

B)  4, 5, 6; 7, 8, 9; 1, 2, 3

C)  3, 4, 7; 1, 6, 9; 2, 5, 8                                      

D)  1, 6, 8; 3, 4, 7; 2, 5, 9