第2378题：Applications in physics

Assume the mass of the Earth is M. To calculate the work done（$W_h$） in moving an object of mass m from a distance h from the Earth's center to infinity, which of the following four options (A, B, C, D) is the correct expression?

A. $W_h= GMm \int_0^{h} \dfrac{dx}{x^2}$

B.$W_h= GMm \int_h^{+\infty} \dfrac{dx}{x^2}$

C.$W_h=\dfrac{GMm}{h} \int_0^{h} \dfrac{dx}{x^2}$

D.$W_h=\dfrac{GMm}{h} \int_h^{+\infty} \dfrac{dx}{x^2}$

Newton's Law of Universal Gravitation: F = GMm/r², where G is the gravitational constant, r is the distance between the two point masses, and M and m are their respective masses.