The gravitational field due to a mass distribution is \[\operatorname{E}=K/{{x}^{3}}\]in the x-direction. (K is a constant). Taking the gravitational potential to be zero at infinity, its value at a distance x is

• A. \[K/x\]
• B. \[K/2x\]
• C. \[\operatorname{K}/{{x}^{2}}\]
• D. \[\operatorname{K}/2{{x}^{2}}\]