Respuesta :
Es simpática is the correct answer. This is because you are talking about someone's mother, so would you would call her by Ella. If you conjugate Ser to match Ella, then Ser would become Es
Choose the appropriate response for the question: ¿Cómo es tu mamá?
Answer : Es simpática.
Explanation : The subject in this sentence is "tu mamá", so the verb has to be conjugated in the third singular person. Ella es.
Hope this helps!
[tex]\textit{\textbf{Spymore}}[/tex]