Respuesta :
The question asks: What day is today?
your options are:
schreiben- the verb to write
gern- gladly
samstag- Saturday
laufen- the verb to walk
So, the most logical response would be Samstag.
It would definitely be Samstag. Since it's referring to a day of the week.
Welcher Tag ist heute? Is asking, what day is it today? So Samstag is the most logical answer.
I only answered this because sometimes we need double of proof towards these things to verify.