Correct Option: A

death (Noun) : the fact of somebody dying or being killed
demise (Noun) : death; the end or failure of an institution, an idea or a company, etc.
misfortune (Noun) : bad luck; an unfortunate accident, condition or event
accident (Noun) : an unpleasant event that happens unexpectedly and causes injury or damage
dismissal (Noun) : the act of dismissing somebody from his job; the failure to consider something as important