Group the given figures into three classes using each figure only once.
A.
1,2,6 ; 3,4,7 ; 5
B.
1,3 ; 2,6 ; 4,5,7
C.
1,2,6,7 ; 3 ; 4,5
D.
1,3 ; 2,4,5 ; 6,7
Correct answer is D
1, 3 contain a V-shaped element inside a geometrical figure.
2, 4, 5 contain two similar elements, one placed inside the other and touching it.
6, 7 contain geometrical figures which are divided into four equal parts by two mutually perpendicular straight lines.