which of these quadrilateral types must have congruent diagonals. a. rectangle, square, rhombus b. square, rhombus c. rectangle, square d. parallelogram, rectangle, square, rhombus

(C. Rectangles and squares)

This is because a square IS a rectangle and has alike properties. A rectangle always has congruent diagonals, therefore passing the property onto the square. Even though a square is a combination of a rhombus, a rhombus doesn't have congruent diagonals. Finally, a parallelogram can be any shape so it doesn't necessarily have to have congruent diagonals