When Rahul was born, his father was 32 years older than his brother and his mother was 25 years older than his sister. If Rahul's brother is 6 years older than him and his mother is 3 years younger than his father, how old was Rahul?s sister when he was born?

• A.  10 years
• B.  7 years
• C.  14 years   
• D.  20 years