Mark against the correct answer in each of the following:

Mark $(\sqrt{ })$ against the correct answer in each of the following:

$\int \mathrm{e}^{\mathrm{x}}\left\{\frac{1}{\mathrm{x}}-\frac{1}{\mathrm{x}^{2}}\right\} \mathrm{dx}=?$

A. $e^{x}\left\{\log x+\frac{1}{x}\right\}+C$

B. $x e^{x}-e^{x}+C$

C. $\mathrm{e}^{\mathrm{x}} \cdot \frac{1}{\mathrm{x}}+\mathrm{C}$

D. none of these