The arithmetic mean of the series 1, 2, 4, 8, 16, . . . . . . , 2nis -

• A. $\frac{{{2^n} - 1}}{{n + 1}}$$
• B. $\frac{{{2^n} + 1}}{{n}}$$
• C. $\frac{{{2^n} - 1}}{{n}}$$
• D. $\frac{{{2^{n + 1}} - 1}}{{n + 1}}$$