Tính tính nguyên hàm của (3/x^2 +2^x )dx

A. $\int (\frac{3}{{\mathrm{x}}^2}+2^{\mathrm{x}})\mathrm{dx}=3{\mathrm{lnx}}^2+\frac{2^{\mathrm{x}}}{\ln 2}+\mathrm{C}$

B. $\int (\frac{3}{{\mathrm{x}}^2}+2^{\mathrm{x}})\mathrm{dx}=\frac{3}{x^3}+2^x+C$

C.$\int (\frac{3}{{\mathrm{x}}^2}+2^{\mathrm{x}})\mathrm{dx}=\frac{-3}{\mathrm{x}}+\frac{2^2}{\ln 2}+\mathrm{C}$

D. $\int (\frac{3}{{\mathrm{x}}^2}+2^{\mathrm{x}})\mathrm{dx}=\frac{-3}{\mathrm{x}}+2^{\mathrm{x}}.\ln 2+\mathrm{C}$