Hello!
The first one has just 4 right angles, along with parallel sides. It is a rectangle.
The second one has four right angles, congruent sides, and parallel sides. It is a square.
The third one has four congruent sides. It is a rhombus.
The fourth has parallel sides. It is a parallelogram.
a. Rectangle
b. Square
c. Rhombus
d. Parallelogram
I hope this helps!