Answer:
Soy Patricia. Me gusta cocinar en la celebración del Día de la Madre.
Sí, a tu mamá le gustan el pescado y el pastel que cocinas en el horno.
Explanation:
Soy Patricia. Me gusta cocinar en la celebración del Día de la Madre. In English this means: I like cooking in Mother's day celebration. In this case the "me" refers to myself, it's talking in first person. "Gusta" is in singular because it's talking about cooking. The option "me gustan" could only be used to talk about something in plural, for example: "<u>Me gustan las comidas</u> del día de la Madre".
The other sentence: Sí, a tu mamá le gustan el pescado y el pastel que cocinas en el horno. In English this means: Yes, your mother likes the fish and pie you bake in the oven. "Le" is referring to her, to "your mother" and that's why it's singular. However, "gustan" is in plural because it's referring to the fish and the pie, which are two and therefore are plural.