Geometry

Question Analysis：
This question tests recognition of the sufficient angle condition to prove a parallelogram.

Key Concept Explanation：
A quadrilateral is a parallelogram if：
• Both pairs of opposite angles are equal, OR
• Both pairs of adjacent angles are supplementary

Step-by-Step Solution：
Evaluate options：
A) Invalid (sum exceeds 180°)
B) Correct (shows both opposite angle pairs equal)
C) Only shows one adjacent pair
D) Doesn't provide sufficient information

Common Mistakes：
• Choosing options that...