What is \(\smallint \frac{{dx}}{{{2^x} - 1}}\) equal to?

• A. ln(2x – 1) + c
• B. \(\frac{{\ln \left( {1 - {2^{ - x}}} \right)}}{{ln2}} + c\)
• C. \(\frac{{{\rm{ln}}\left( {{2^{ - x}} - 1} \right)}}{{2\ln 2}} + c\)
• D. \(\frac{{\ln \left( {1 + {2^{ - x}}} \right)}}{{ln2}} + c\)