I am a quadrilateral with opposite sides congruent; all angles are right and opposite sides are parallel.

A) rectangle

B) Square

C) parallelogram

D) Rhombus

E) none of the above

It is a rectangle.

It can be a parallelogram but in this case it isn't. A parallelogram may include all these details but not all parallelograms have all right angles. However, a rectangle is both a parallelogram and has all right angles. Therefore, rectangle is the best answer.