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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, 5; 2, 4, 6; 7, 8. 9                                      

B)  1, 2, 9; 3, 4, 6; 5, 7, 8

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

D)  1, 3, 4; 2, 5. 8; 6, 7, 9