Group the given figures into three classes using each figure only once.
A.
1,2,3 ; 4,5,6 ; 7,8,9
B.
1,3,5 ; 2,4,6 ; 7,8,9
C.
1,5,9 ; 3,6,2 ; 4,7,8
D.
1,9,7 ; 2,8,5 ; 3,4,6
Correct answer is A
1, 2, 3 are figures composed of two straight lines.
4, 5, 6 are figures composed of three straight lines.
7, 8, 9 are figures composed of four straight lines.