C. an understood you, because usually you is the subject in the sentence, but it is understood without it.
Answer:
Events are decided in advance by powers beyond one's control.
Explanation:
A fatalist is one who believes in fate (happening of events outside a person's control, predetermined by supernatural forces). This definition is also evident from the sentence which he himself says in explanation of fatalist i.e "What will be, will be", meaning what is bound to happen, will happen.
Option A is incorrect because fatalist is derived from fate, not fatal (deadly)
Options B and D are incorrect because they are opposite of what "fate/fatalist" mean.
I believe that it is
C. When the three girls walk down the street
