There are two brothers Rohan and Rajiv. Rohan is three years older than his brother Rajiv. Ten years ago, At the time of the birth of their sister, the age of Rohan was 8 years. The present age of the father is the sum of the age of Rohan, Rajiv, and their sister. The sum of the present age of Parents is 84 years. Find the difference between the present age of their parents.

• A. 2 years
• B. 1 years
• C. 3 years
• D. 5 years
• E. 0 years