Read the passage: 'During bushfire operations, the containment line must be cleared of all organic matter. Crew safety depends on maintaining a buffer zone of at least 20 meters from active flames. If wind speeds exceed 30 km/h, crews must retreat to designated safety zones immediately.' Based on this passage, which statement is true?
- AOrganic matter can remain on containment lines if wind speeds are low.
- BCrews must retreat to safety zones if wind speed is exactly 25 km/h.
- CActive flames must be kept at least 20 meters away from the buffer zone boundaries.
- DCrews must retreat immediately if wind speeds reach 35 km/h.