Answer:
Authors choice of words give a emotional effect to the reader.
Step-by-step explanation:
Remember that diction is the authors choice of words or phrases he/she uses in a story. In this case the author using certain words and phrases can give a emotional effect to the reader because if you use terms that are serious it will give off a serious tone but if you are trying to come off as serious but using terms or phrases that don't go with that tone you are trying to give off, it might give the reader a different emotional effect that you weren't trying to give.
Hope this helps.