Read the following statement on aerospace materials and choose the most valid logical inference: "Although carbon-fiber reinforced polymers (CFRP) yield outstanding specific strength and fatigue resistance in airframes, their low interlaminar shear strength makes them uniquely prone to subsurface delamination under impact, necessitating ultrasonic phased-array inspection." Which statement is directly supported by the passage?

(A) CFRP structures cannot fail under cyclic fatigue loading.

(B) Subsurface damage in composite airframes cannot be detected by visual inspection alone.

(C) Ultrasonic inspection prevents impact damage from occurring on composite wings.

(D) Metals possess higher specific strength than carbon-fiber reinforced polymers.

Answer Key:

B

### 5-Stage Derivation & Analytical Solution: 1. **Stage 1: Passage Premise:** The passage highlights "subsurface delamination" requiring "ultrasonic phased-array inspection". 2. **Stage 2: Logical Deduction:** Subsurface means below the surface, which inherently implies optical/visual inspection is insufficient. 3. **Stage 3: Distractor Elimination:** Option A is false (CFRP has good fatigue resistance, not immunity); Option C confuses inspection (detection) with prevention; Option D directly contradicts "outstanding specific strength". 4. **Stage 4: Conclusion:** Option B is logically sound and directly supported.

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