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Quadrilateral ABCD is a parallelogram because of the following conditions:
a)  It has two pairs of parallel opposite sides
b)  It has two pairs of congruent opposite sides.
c)  Two opposite side that are both parallel and congruent.
d)  Because of item c., the opposite angles are congruent

2) Why did you say so:
Answer:  Given measurements

AB = 6;  CD = 6
Side AB is congruent Side CD

AD = 7; BC = 7
Side AD is congruent to Side BC

AB II CD (AB is parallel to CD)

AD II BC (AD is parallel to BC)