When One of Waata's Employees Was Stocking a Particularly High

When one of Waata's employees was stocking a particularly high shelf one morning; he reached a bit too far and fell off the ladder. Luckily he just broke his arm and returned to work later that day. His medical bills due to this accident were covered under

A) workers' compensation.
B) disability insurance.
C) liability insurance.
D) his own health insurance.