Group the given figures into three classes using each figure only once.
A.
1,5,8 ; 2,6,7 ; 3,4,9
B.
1,5,7 ; 2,6,8 ; 3,4,5
C.
1,5,8 ; 2,4,7 ; 3,6,9
D.
1,5,8 ; 2,6,9 ; 3,4,7
Correct answer is C
3, 6, 9 are geometrical figures containing line segments (the number of these line segments is half the number of sides in the figure) parallel to the sides of the figure.
1, 5, 8 consist of a circle and a triangle intersecting it. The triangle is also divided into two equal parts by a straight line.
2, 4, 7 are all funnel shaped figures.