The value of \(\mathop {\lim }\limits_{x \to 1} \left( {\frac{{1 - {e^{ - c\left( {1 - x} \right)}}}}{{1 - {xe^{ - c\left( {1 - x} \right)}}}}} \right)\) is

• A. c
• B. c + 1
• C. \(\frac{c}{{c + 1}}\)
• D. \(\frac{{c + 1}}{c}\)