3. Tests for Parallelograms
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Recall the Conditions of Parallelograms.
B
If one pair of opposite sides of a quadrilateral is both parallel and congruent, then this quadrilateral is a parallelogram. We are given that in a quadrilateral ABCD sides AB and DC are parallel. Therefore, to prove that this quadrilateral is a parallelogram, these sides also need to be congruent. This corresponds with answer B.