When a cone is unrolled, it forms a sector with:

• Radius of sector = slant height = 25 cm
• Arc length of sector = circumference of base = \(2\pi r = 2\pi \times 7 = 14\pi\ \text{cm}\

Angle of sector: \(\theta = \dfrac{\text{arc length}}{\text{radius}} = \dfrac{14\pi}{25}\ \text{radians}\

In degrees: \(\theta = \dfrac{14\pi}{25} \times \dfrac{180}{\pi} = \dfrac{14 \times 180}{25} = \dfrac{2520}{25} = 100.8°\

Wait — that gives 100.8°. The answer is option B (100.8°). Correcting: answer index should be 1.