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Direction: In each of the following questions, a set of some figures is given. Group these figures into three classes on the basis of their identical properties using each figure only once.

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

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

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

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