Nếu thì f(x) là

A. \(f\left( x \right) = \sqrt x + \ln x + C\)

B. \(f\left( x \right) = - \sqrt x + \frac{1}{x} + \ln x + C\)

C. \(f\left( x \right) = - \frac{1}{{{x^2}}} + \ln x + C\)

D. \(f\left( x \right) = \frac{{x - 1}}{{{x^2}}}\)