Kavya's savings is four times that of her sister. When she spends Rs. 15 and her sister saves Rs. 45, both of them have the same amount of money. How much does Kavya and her sister respectively have in their savings at first?

• A.  Rs. 60, Rs. 100  
• B.         Rs. 100, Rs. 60  
• C.  Rs. 80, Rs. 20    
• D.         Rs. 20, Rs. 80