1.

Group the following figures into three classes on the basis of identical properties:

A. 1, 3, 9; 2, 4, 6; 5, 7, 8
B. 1, 5, 9; 2, 4, 6; 3, 5, 7
C. 1, 2, 5; 3, 6, 7; 4, 8, 9
D. 1, 5, 9; 2, 3, 6; 4, 8, 7
Answer» E.


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