I think you can use your own experiences to better understand characters, events, and ideas.
The Right answer is a. an event, an action, or a situation that produces a result.
The explanation for this is that according to the dictionary Aurélio, cause is what makes a thing to be, to exist or to happen. It is the principle, the reason or the origin of something.
The appositive states what the subject has or does in a sentence
What? are you trying to comment to someone?