The correct option is C 13:6
Given: Anita's present age = 42 years
Her niece's present age = 14 years
After 10 years from now, Anita's age = (42 + 10) years = 52 years
Niece's age = (14+10) years = 24 years
Ratio of Anita's age to her niece's age = 5224=136⇒13:6
Therefore, the required ratio is 13:6.