Tính tổng S=1+2.2+3.2^2+4.2^3+...+2018.2^2017 A. S=2017.2^2018+1

A. $S=2017.2^{2018}+1$

B. $S=2017.2^{2018}$

C. $S=2018.2^{2018}$

D. $S=2019.2^{2018}+1$