Read the text and answer the question. TEXT B — Thunderstorms at the Airport When a thunderstorm approaches an aerodrome, operations change quickly. Controllers may close the runway, ground crews suspend ramp handling because lightning endangers personnel outdoors, and arriving aircraft may be instructed to hold or divert to an alternate airport. Microbursts — intense, localized downdrafts — are among the most feared phenomena, because an aircraft that encounters one close to the ground can lose lift faster than the pilot can react. Forecasts therefore play a central role: aerodrome meteorological observations and terminal forecasts allow supervisors to anticipate the closure window and, where possible, to reopen operations as soon as the cell has passed and the runway has been inspected for standing water. According to Text B, when a thunderstorm approaches, ground crews suspend ramp handling because:

1. Lightning endangers personnel working outdoors
2. The radar screens must be switched off during storms
3. Aircraft cannot be refueled at night under any circumstances
4. The terminal building must be evacuated first