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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)  2.4, 7; 1,6, 9; 3, 5, 8                                        

B)  1,3, 5; 2,6, 7; 4, 8, 9

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

D)  1, 3, 5; 2,4, 7;6,8,9