Answer:
a) adding two circles on the left and a square on the right.
Step-by-step explanation:
on the right, there is a square and a triangle
on the left, there are two circles and a triangle
both sides have a triangle so you don't need to worry about that
to balance the hanger, add what is missing:
the left is missing two circles
the right is missing a square
therefore, add 2 cicles to the left and a square to the right
