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

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

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

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

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