A series of figures are given which can be grouped into classes. Select the group into which the figures can be classified from the given responses.

• 1, 6, 9; 2, 4, 7; 3, 5, 8
• 1, 6, 9; 3, 4, 7; 2, 5, 8
• 2, 6, 9; 1, 4, 3; 5, 7, 8
• 2, 9, 3; 1, 8, 7; 4, 5, 6