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Subject :IMO    Class : Class 6

Group the given figures into three classes using each figure only once.

A1,3,9; 2,5,6; 4,7,8
B1,3,9; 2,7,8; 4,5,6
C1,2,4; 3,5,7; 6,8,9
D1,3,6; 2,4,8; 5,7,9

Correct answer is A . I clicked 'a' and rechecked 2 times.....yet when I clicked submit they said I clicked 'd' and that I got it wrong

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