Hello. You didn't show the answer options, so I will consider all the characters in the plot.
Answer:
Larissa
Step-by-step explanation:
Larissa is an elderly woman who lives in a nursing home where Jonas is a volunteer. She tends to disagree with Jonas' words a lot and to speak out against sharp arguments in the conversations between Jonas and her. That's because Larissa is very fond of lively discussions and debates, where she can give a sincere opinion and stimulate her thoughts to argue efficiently.