Respuesta :
The answer is: ¿Cuando es tu cumpleaños?
At first, Carlos asks Roberto: How old are you?
Roberto answers: I am sixteen years old.
Then there is a blank (where we have to put the question Carlos asked next in)
And Roberto answers: January 14.
So it would make sense for Carlos to ask “When is your birthday?”
PLEASE MARK AS BRAINLIEST.