Geometry

Question Analysis：
Use coordinate geometry to test for congruent opposite sides.
Focus is on using the distance formula.

Key Concept Explanation:
If both opposite sides are congruent, it qualifies as a parallelogram.

Step-by-Step Solution：
JK = √[(4 – 0)² + (3 – 0)²] = √(16 + 9) = √25 = 5
LM = √[(7 – 3)² + (3 – 0)²] = √(16 + 9) = √25 = 5
→ JK ≅ LM
KL = √[(7 – 4)² + (3 – 3)²] = 3
MJ = √[(3 – 0)² + (0 – 0)²] = 3
→ KL ≅ MJ
→ Both pairs of opposite sides are congruent ⇒ Parallelogram

Option Analysis：
A – ✔ ...