Given a rhombus, a square, and a rectangle, what must be true of all three quadrilaterals? a. the diagonals are congruent. b. the diagonals bisect each other. c. the diagonals are perpendicular. d. each of the diagonals bisects both angles.

For a rhombus, the diagonals are not congruent- eliminating choice A. The diagonals are not perpendicular for a rectangle- eliminating answer choice C. Finally all of them bisect each other, so the answer you HAVE been working s hard for is ANSWER CHOICE B.

The diagonals bisect each other.

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