The correct answer is “se les olvido”
?? Is there a question or attachment?
"Hice", because is the past of the verb "Hacer" in the first person.
Conoce (3)
she recognizes your parents' home
conocen is plural and monica is only one person so that is false
saben is (they know) again plural and referring to someone other than monica
and sabe is "know" but translated over it does not make sense because it has a different meaning
