I think it's
B.) Yo voy a cumplir quince años.
Since the answer is telling us that he is 14 so the logical answer would be that he is gonna soon be 15:)
Hope this helps
Answer:
Tu: te levantas Nosotros: nos levantamos Ellas: se levanta
Yo: me afeito Nosotros: nos afeitamos Ellas: se afeita
Yo: Me visto Tu: te vistes Ellas: se viste
Yo: Me seco Tu: Te secas Nosotros: Nos secamos
