Final answer:
The appropriate verb form to fill in the blank is 'gustan'.
Step-by-step explanation:
The appropriate verb form to fill in the blank in the sentence is 'gustan'.
When talking about liking something in Spanish, we use the verb 'gustar'. It is conjugated according to the subject of the sentence.
In this case, because the subject is 'A ti' (You), the correct form of the verb is 'gustan'.
Learn more about Verb conjugation in Spanish