Hey !
i almost always get confused when questions related to rotational symmetry are asked ....could anybody explain the concept clearly ?
using a tracing paper would help!
draw the shape on a tracing paper
place the tracing paper on the original shape, and start rotating it
and count how many times the shape is exactly the same.
2 for rectangle, the shape will be exactly the same 2 times, 1 after rotating it by 180degrees and one by 360degrees.
hope i helped