How do you prove the parallegram theorem

Step 1: Prove that both pairs of opposite sides are parallel.

Step 2: Prove that both pairs of opposite sides are congruent.

Step 3: Prove that one pair of opposite sides is both congruent and parallel.

Step 4: Prove that the diagonals bisect each other.

Hope this helps.

could u provide us some answer choices or hmm idk maybe a table for us to anser with ? ?

answer: the answer is d