Correct Answer - Option 2 : 28 cm

**Given**

Lateral surface area of cylinder = 308 cm^{2}

Height of cylinder = 3.5 cm

**Formula used**

Lateral surface area of cylinder = 2πrh

**Calculation**

2πrh = 308

⇒ 2 × (22/7) × r × (3.5) = 308

⇒ r = (308 × 7)/(2 × 22 × 3.5)

⇒ r = 14 cm

Diameter of cylinder = 2 × radius

⇒ 2 × 14

⇒ 28 cm

**∴ Diameter of cylinder is 28 cm**