Final answer:
The correct verb form to fill in the sentence is 'te gustan'.
Step-by-step explanation:
The correct verb form to fill in the sentence is te gustan.
'Te gustan' is the appropriate verb form because 'ti' is the informal second person singular pronoun in Spanish. When talking about liking something, we use the verb 'gustar' which literally means 'to be pleasing'. In this case, 'gustan' is used because 'manzanas' is a plural noun and it agrees with the subject pronoun 'te'.
Example: A ti te gustan las manzanas.
Learn more about Verb form in Spanish