Group the given figures into three classes using each figure only once.
A.
1,5,7 ; 2,4,6 ; 3,9,8
B.
1,5,7 ; 2,4,8 ; 3,6,9
C.
1,4,7 ; 2,5,8 ; 3,6,9
D.
1,7,9 ; 3,5,8 ; 2,4,6
Correct answer is B
1, 5, 7 have two similar elements, one inside the other.
2, 4, 8 have one element placed inside a different element.
3, 6, 9 have two similar elements, one inside the other and the area between the two elements is shaded.