Which statement is true?

A) All rectangles are squares.

B) All parallelograms are rectangles.

C) All squares are rectangles.

D) All quadrilaterals are rectangles.

C is the correct answer

A) False. Some rectangles do not have all four sides that are the same length.

B) False. If the four angles are not all 90 degrees, then it is a non-rectangular parallelogram.

C) True. A square is always a rectangle since a square has four right angles. The same isn't always true in reverse (as choice A mentions). A square is also always a rhombus.

D) False. It is possible to draw a four-sided figure that does not have four right angles.

Answer is choice C