Group the given figures into three classes using each figure only once.
A.
1,3,6 ; 4,5,8 ; 2,7,9
B.
2,3,9 ; 4,5,8 ; 1,6,7
C.
1,6,8 ; 3,7,9 ; 2,4,5
D.
3,8,9 ; 1,2,7 ; 4,5,6
Correct answer is C
1, 6, 8 are figures composed of straight as well as curved lines.
3, 7, 9 are closed figures shaded by oblique line segments.
2, 4, 5 are figures composed of straight lines only.