Explanation:

Let’s break it down and see which answer fits:

- The wheel’s diameter is 14 cm, so the circumference is p × 14 = about 44 cm.

- The cyclist is riding at 11 km/h for 30 minutes. That means they travel 5.5 km (since 11 × 0.5).

- That’s 550,000 cm in total (since 1 km = 100,000 cm).

- Now, the number of revolutions is total distance divided by circumference: 550,000 ÷ 44 ˜ 12,500.

- Option 1: 12,500 – This matches our calculation.

- Option 2: 15,000 – This is too high.

- Option 3: 17,750 – Even higher.

- Option 4: 20,000 – Much too high.

So, Option 1: 12,500 is clearly correct.