The goal of this task is to translate questions in Catalan into English. The requirements of the translation is that: the text must be equivalent in meaning, the text must not be ambiguous, and the text must be written as a question

Què formen l’àrea metropolitana de El Centro i l’àrea metropolitana de San Diego-Carlsbad-San Marcos?
What does the El Centro metropolitan area and San Diego-Carslbad-San Marcos metropolitan area form?