Answer:
D
Step-by-step explanation:
Because these are the 7 properties of a parralelgrom 
Opposite sides are parallel.
Opposite sides are congruent. 
Opposite angles are congruent. 
Same-Side interior angles (consecutive angles) are supplementary. .
Each diagonal of a parallelogram separates it into two congruent triangles. 
The diagonals of a parallelogram bisect each other.