Answer:
a) entienden
Explanation:
Entienden is the only word that is in the present
mon:lunes
tues:martes
wed:miercoles(accent on first "e")
thurs:jueves
fri:viernes
sat:sabado(accent on first "a")
sun:domingo
I'm not sure of the vocab you're supposed to use, but I think it's: Manuel Carmen, estoy (I am) muy contento por ellos, pero eso (that) es algo enfermo y no puedo ir.
Hope that helps and is somewhat correct!