Geometry

Question Analysis
This question tests the ability to derive the contrapositive of a geometric statement about supplementary angles.

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

Step-by-Step Solution:
Original statement: "If two angles are supplementary (P), then their sum is 180 degrees (Q)."
Contrapositive: "If the sum of two angles is not 180 degrees (not Q), then they are not supplementary (not P)."
The correct answer is B.

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