Answer:
The correct answer is A. A trapezoid has only 1 pair of parallel sides, but a parallelogram has 2.
A parallelogram is a quadrilateral with opposite sides that are parallel and equal in length. A trapezoid is a quadrilateral with one pair of opposite sides that are parallel, known as the bases. The other two sides are called legs.
Both a parallelogram and a trapezoid are quadrilaterals that have four sides, but parallelogram has opposite sides parallel to each other, while trapezoid has only one pair of parallel sides, the bases. Also a parallelogram has opposite angles are equal while a trapezoid doesn't have this property.
Option B and D is incorrect, A parallelogram doesn't need to have 4 right angles, and a trapezoid doesn't need to have 4 right angles as well.
Option C is incorrect as well, A parallelogram has two pairs of parallel sides.