Geometry

Question Analysis
This question involves identifying the contrapositive of a statement about linear functions and their graphs.

Key Concept Explanation:
The contrapositive of "If P, then Q" is "If not Q, then not P."
It is logically equivalent to the original statement.

Step-by-Step Solution:
Original statement: "If a function f(x) is linear (P), then its graph is a straight line (Q)."
Contrapositive: "If a function's graph is not a straight line (not Q), then it is not linear (not P)."
The contrapositive is true because it is logically equivalent to the original statement.

Option Analysis:
A: This is the converse, not the contrapositive.
B: Correct contrapositive and true.
C: This is the inverse, which is false (e.g., a constan...