The appropriate response for the question, "Wie heißt du?" would be: "Ich heiße Felix."
The appropriate response to the question "Wie heißt du?" would be "Ich heiße Felix." This means "My name is Felix" in English. The other responses provided are not related to the question and do not answer it correctly. To determine the correct response, you should understand that "Wie heißt du?" is asking for someone's name, so the appropriate answer would be the one that provides the person's name.
