A parallelogram must be a rectangle if it's diagonals are perpendicular to each other. Therefore, the correct option is C.
That quadrilateral in which opposite sides are parallel is called a parallelogram.
Thus, a parallelogram is always a quadrilateral but a quadrilateral can or cannot be a parallelogram.
The parallelogram in which adjacent sides are perpendicular to each other is called a rectangle.
Rectangle is always a parallelogram and a quadrilateral but reverse statement may or may not be true.
A parallelogram must be a rectangle if it's diagonals are perpendicular to each other.Therefore, the correct option is C.
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