The tenths digit is $$6$$ and the hundredths digit is $$7$$. Their sum is $$13$$. 
What is the sum of the tenths and the hundredths digits in the num-ber $$12345.6789$$? 
(A) $$7$$ 
(B) $$11$$ 
(C) $$13$$ 
(D) $$15$$ 