The correct answer is A. Flying
Step-by-step explanation:
Struck-by hazard is a term that refers to events or incidents that injure workers or put their lives at risk as they are hit by objects, machines, etc. In the case of struck-by flying, this occurs as one element, object or similar is propelled across space or flies and hits a worker leading to injuries or fatalities. For example, in construction a flying struck-by hazard can occur is nail is accidentally propelled using a nail gun and this hits a worker causing him/her injuries. Thus, the type fo struck-by hazard event that occurs when an object is thrown, hurled or propelled is flying.