The correct pronoun to complete the sentence is "te."
So the completed sentence would be: "¿Tú te llamaste?"
However, please note that "llamaste" typically means "you called" in the sense that someone called you. In this specific context and phrase, the intended response might be focusing on whether you called the person or not. If the interpretation is "Did you call me?", then it is aimed toward "me" in English. But with the direct object pronoun, it depends on the structure you're following.
For "Did you call me?", it would be more appropriately translated as "¿Tú me llamaste?" If focusing on the pronoun directly, for addressing "you", then answer is "te".
So if you strictly go with the provided alternatives: the answer is "te".