1. 

Group the given figures into different classes on the basis of their orientation, shape etc.

grouping-of-figures-non-verbal-reasoning-introduction---grouping-of-figures-problems
A. (1, 4, 9), (2, 6, 8), (3, 5, 7)
B. (1, 2, 8), (3, 5, 7), (4, 6, 9)
C. (2, 5, 8), (4, 6, 9), (1, 3, 7)
D. (1, 4, 9), (2, 7, 8), (3, 5, 6)

Answer: Option D

Explanation:

1, 4 and 9 form a group of figures which are divided into two equal parts and each part contains one small dark circle.
2, 7 and 8 form a group of figures in which lines equal to the number of lines present in the main figure are present inside the figure (one line parallel to each line).
3, 5 and 6 form a group of figures in which two straight lines mutually perpendicular to each other are present.