Which of the following statements is not always true?

Question

A.
In a rhombus, the diagonals bisect opposite angles.
B.
In a rhombus, the diagonals are perpendicular.
C.
In a rhombus, the diagonals are congruent.
D.
In a rhombus, all four sides are congruent.

I think the answer is A. :-)

Answer 1

C is true only if the rhombus is a square

Answer 2

B is the right answer.