What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)

What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)

A 2GR
B 2G/R
C 2GR²
D 2GM/R

waec 1995 physics

The correct answer is D. 2GM/R

No explanation given

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