The gravitational field due to a mass distribution is \[E=K/{{x}^{3}}\] in the x-direction. (K is a constant). Taking the gravitational potential to be zero at infinity, its value at a distance x is [MP PET 1994]

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