Answer: The answer should be 'C'
Explanation: The way we use fate is pretty simple,
"the development of events beyond a person's control, regarded as determined by a supernatural power.
"fate decided his course for him"" You could also think of it as destiny if that would be easier for you, Fate basically means that "The Stars aligned for this event to happen"
And in this case I would say the best answer would be 'C' "It was fate for me to arrive downtown just as my best friend got off another bus."