Correct Answer:

Solution : According to the given figure series –
1. From Box 1 to Box 2: The bottom left rectangle and top right corner circle move to the centre of the box 2.
2. From Box 2 to Box 3: The circle moves to the bottom left corner, the rectangle is replaced with a triangle, and the triangle is moved to the top right corner of Box 3.
By following the same pattern according to the given options the required missing figure is –

Hence, the third option is correct.