Connie counts from $$1$$ to $$20$$. The sum of the prime numbers she counts is $$2+3+5+7+11+13+17+19=77$$. (Note: $$1$$ is not prime.) 
Connie counts from $$1$$ to $$20$$. What is the sum of the prime numbers she counts? 

a. $$29$$ 
b. $$30$$ 
c. $$77$$ 
d. $$78$$ 