Answer:
The correct answer is 
Step-by-step explanation:
B- They are always congruent. Congruent means in agreement or harmony. But in this case, identical in form. Parallelograms are parallel on both sides, which makes them have congruent sides.
P.S.- This is elementary level, no offense.
Answer:
It's a function, none.
<em>good luck, i hope this helps :)</em>