which quadrilateral is a trapezoid?

Explanation:

Step1: Recall trapezoid definition

A trapezoid is a quadrilateral with exactly one pair of parallel sides.

Step2: Analyze first figure

In the first - figure with vertices (A), (B), (C), (D), (AD) and (BC) are parallel (indicated by the right - angle marks on (AB) and (CD) which are perpendicular to (AD) and (BC)). It has exactly one pair of parallel sides.

Step3: Analyze second figure

In the second figure with vertices (E), (F), (G), (H), there are no parallel sides indicated.

Step4: Analyze third figure

In the third figure with vertices (J), (K), (L), (M), both pairs of opposite sides are parallel (indicated by the double - arrow marks), so it is a parallelogram, not a trapezoid.

Answer:

The first quadrilateral (with vertices (A), (B), (C), (D)) is a trapezoid.