Which statements are true for the given quadrilaterals?

choose all answers that are correct.

a.
all rhombuses are rectangles.

b.
all squares are rhombuses.

c.
all parallelograms are quadrilaterals.

d.
all rectangles are squares.

The answer is C because all the other answers are false.  A rhombus does not have right angles, which is a characteristic of a rectangle.  A rhombus does not have right angles - it has two obtuse and two acute.  All rectangles are not squares because the sides need not have equal length.  That leaves C.  Parallelograms have 4 sides, which makes them a variety of quadrilateral

c  and a because  because parallelograms have four sides an