Geometry

Question Analysis
This question tests the ability to derive the contrapositive of a statement about parallelograms.

Key Concept Explanation:
The contrapositive of "If P, then Q" is "If not Q, then not P."

Step-by-Step Solution:

Original statement: "If a shape is a parallelogram (P), then its opposite sides are parallel (Q)."
Contrapositive: "If a shape's opposite sides are not parallel (not Q), then it is not a parallelogram (not P)."
The correct answer is B.

Option Analysis:
A: This is the converse, not the contrapositive.
B: Correct contrapositive.
C: This is the inverse, not the contrapositive.
D: Th...