Interpreting Stress-Strain Graph for Wire Properties Steps:

• Identify key regions: elastic limit where strain reverses, plastic deformation beyond, and fracture point.
• Note proportionality: linear region shows Hooke's law (stress ∝ strain).
• Locate yield point: transition from elastic to plastic behavior.
• Determine ultimate tensile strength: maximum stress before necking.

Why D is correct:

• D identifies the ultimate tensile strength as the peak stress on the graph, per definition as highest load-bearing capacity before failure.

Why the others are wrong:

• A confuses elastic modulus with yield strength; modulus is slope of linear portion.
• B mislabels fracture point as ultimate strength; fracture occurs after necking.
• C mistakes proportional limit for yield point; proportional limit is end of linear elasticity.

Not enough information: Graph and choices not provided for full verification.

Final answer: D