Which characteristics will not prove that quadrilateral pqrs, drawn in a coordinate plane, is a parallelogram?
a. the slopes and lengths of top enclose p q end enclose and top enclose r s end enclose are equal.
b. the slopes of top enclose p q end enclose and top enclose r s end enclose are equal, and the slopes of top enclose q r end enclose and top enclose s p end enclose are equal.
c. the slopes of top enclose p q end enclose and top enclose r s end enclose are equal, and the lengths of top enclose q r end enclose and top enclose s p end enclose are equal.
d. the lengths of top enclose p q end enclose and top enclose r s end enclose are equal, and the lengths of top enclose q r end enclose and top enclose s p end enclose are equal?