Ten years ago, the sum of the ages of my mother and father was $$71$$. Each has aged $$10$$ years, so the sum of their ages is now $$91$$. 
Ten years ago, the sum of the ages of my mother and father was $$71$$. What is the sum of their ages today? 
(A) $$51$$ 
(B) $$61$$ 
(C) $$81$$ 
(D) $$91$$ 