Amongst the given figures, the one having maximum number of lines of symmetry is:

• 1. Arrow (in circle) has 1 line of symmetry.
• 2. '+' (in circle) has 4 lines of symmetry — horizontal, vertical and the two diagonals.
• 3. '÷' (in circle) has 2 lines of symmetry — horizontal and vertical.
• 4. 'X' (in circle) has 2 lines of symmetry of diagonal because the arms of X in the given figure are not equal.

The '+' symbol has the maximum number of lines of symmetry.

Hence, Option 2 is the correct option.