Respuesta :
Cambias should be the correct answer because it is the conjugation for the tú form of that verb.
Cambias would be the answer. Follow the chart for conjugating verbs. Yo- o
Tu- as
Él, Ella- a
Nosotros- Amos
Vosotros- ais
Ellos/Ellas- an
Tu- as
Él, Ella- a
Nosotros- Amos
Vosotros- ais
Ellos/Ellas- an