Final answer:
The minimum size typically needed for a helicopter to land safely is 75 feet by 75 feet.
Therefore, the correct answer is: option B). 75 feet by 75 feet
Step-by-step explanation:
The appropriate-sized landing zone for a helicopter, especially in the context of medical evacuations or emergency responses, should offer ample space for the aircraft to land safely without obstacles that could interfere with its operations.
Among the options provided, B. 75 feet by 75 feet is typically considered the minimum size needed for a helicopter to land.
However, this can vary based on the type of helicopter and specific operational requirements. Area must be clear of boulders, logs, livestock, and other obstacles. Tall grass needs to be pressed for a flat and clear landing.
If landing on a highway, the helicopter should be a safe distance from the accident with minimum 100 foot surrounding clearance for daytime and 150 foot surrounding clearance for nighttime.
For larger helicopters, a 100 feet by 100 feet area may be more appropriate to ensure safety margins. It's crucial to keep the landing zone clear of debris, vehicles, and people to maintain safety standards.