A sound wave with a power of 8.8 × 10–4 W leaves a speaker and passes through section A, which has an area of 5.0 m2.

Sound intensity is power divided by the area the wave passes through: I = P/A. Using the given values, I = (8.8 × 10⁻⁴ W)/(5.0 m²) = 1.76 × 10⁻⁴ W/m², which rounds to 1.8 × 10⁻⁴ W/m². Therefore, the correct choice is A.

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