Group the given figures into three classes using each figure only once.
A.
1,2,5 ; 3,7,8 ; 4,6,9
B.
1,7,2 ; 3,9,6 ; 4,5,8
C.
2,3,8 ; 4,6,9 ; 1,5,7
D.
5,6,9 ; 3,4,1 ; 2,7,8
Correct answer is A
1, 2, 5 are figures that have patterns formed from four lines curved in a concave direction.
3, 7, 8 are figures that have patterns formed from four lines curved in a convex direction.
4, 6, 9 are figures that have patterns formed from these straight lines.