All of the above! Lionel's answer is wrong!
a) Squares and parallelogram has four sides each, not one more, and not one less.
b)Squares and parallelograms have two parallel lines each, that's for sure.
c)A trapezoid has only pair of parallel lines.
d) YOU'LL NEVER WALK ALONE
Parallelograms DO NOT have right angles! What's that? Means no, they ARE NOT squares!