A) Ayer
B) La semana Pasada
C) hoy
D) hace muchos Años
Ayer means yesterday, it cannot be yesterday as the result will be a Sunday.
La semana pasada means a week ago, if its monday, another monday will be the result as it goes back 7 days.
Hoy means today, which can afterall be an answer as its talking about a monda.
Hace muchos anos can't be it, its too many years back.
The answer is: C