The answer is 3.
Explanation: when talking about being somewhere you have to put the line on top of the letter because without it, the word will not be or sound the same. If you don’t put the little line on top it will sound like you are talking about something for example: if you say esta instead está it will sound like you are saying “this” instead of está.
El tono, it means tone, in the first sentence it says “aparente de la voz” and conflict isn’t a voice, an argument isn’t a voice, and a character isn’t a voice, so the answer is b, el tono