I don’t quite understand what you need, if you were to explain I could help you out!
Answer:
A. Desayuna
Explanation:
Marisol is one person, so we can use the el/ella/usted verb ending.
The ending is -a.
To conjugate:
1. Drop the -ar ending
desayunar --> desayun
2. Add the correct verb ending
desayun--> desayuna
So, choice A is correct
Mm.. i think there’s information missing, are you sure this is the hole text?