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

B)  3, 2, 1; 4, 6, 5; 9, 7, 8

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

D)  1, 4, 5; 9, 1, 3; 7, 8, 6