Drone exam · Ground-risk mitigation Safety Which features can make an apparently empty forced landing area hazardous? Select all correct answers A Skylights. B Fuel or chemical equipment. C People below a roof. D Power lines. E Grass with no nearby hazard. Check answer Correct answers: A, B, C, and D. Skylights; Fuel or chemical equipment; People below a roof; Power lines. Secondary consequences can make an empty looking area a poor choice.