Tara Watches Her Sister Mia,age 9,cry Because Mia Was Not

Tara watches her sister Mia,age 9,cry because Mia was not invited to a birthday party for a friend.Based on her understanding of the concept of loss associated with sadness,how old is Tara?

A) 12-18 months
B) 2-3 years old
C) 4-5 years old
D) 5-6 years old