Group the given figures into three classes using each figure only once.
A.
1,7,9 ; 2,3,6 ; 4,5,8
B.
1,2,9 ; 3,4,6 ; 5,7,8
C.
1,6,8 ; 2,4,7 ; 3,5,9
D.
1,7,8 ; 2,9,3 ; 6,4,5
Correct answer is A
1, 7, 9 contain two similar elements one inside the other but not touching each other.
2, 3, 6 contain two similar elements one inside the other and both touching each other.
4, 5, 8 are divided into equal parts by straight lines emerging from the centre.