Final answer:
The HR manager should first review company emergency protocols and conduct a gap analysis to best prepare field supervisors for emergency situations.
Step-by-step explanation:
The action that the HR manager should take first to ensure that field supervisors are prepared to handle emergency situations in the field is A. Review company emergency protocols and conduct a needs assessment to identify gaps. This is a crucial step in recognizing any deficiencies in current protocols and determining the specific emergency preparedness and response training required by supervisors. Immediate review and training will help the field supervisors to manage similar unfortunate incidents effectively in the future, ensuring both employee safety and compliance with OSHA regulations.
Following the review and assessment, it's critical to develop and offer targeted training programs. This training can teach necessary skills in decision making, teamwork, communication, and stress management, akin to what emergency workers acquire, as cited from the provided material. Such skills could prove valuable in preventing or handling future emergencies.