Group the given figures into three classes using each figure only once.
A.
7,8,9 ; 2,4,3 ; 1,5,6
B.
1,3,2 ; 4,5,7 ; 6,8,9
C.
1,6,8 ; 3,4,7 ; 2,5,9
D.
1,6,9 ; 3,4,7 ; 2,5,8
Correct answer is D
1, 6, 9, are all triangles.
3, 4, 7 are all four-sided figures.
2, 5, 8 are all five-sided figures.