A. Acceleration due to gravity decreases with increasing altitude.

gₕ = (1 - 2h/Rₑ)g

Where h is altitude, Rₑ is Earth's radius (6,371 km), and g is surface gravity (9.81 m/s²).

B. Acceleration due to gravity decreases with increasing depth (assuming uniform density).

g_d = (1 - d/Rₑ)g

Where d is depth below Earth's surface. Gravity is maximum at the surface.

C. Acceleration due to gravity is independent of the body's mass.

g = GM/R²

Where G is the gravitational constant, M is Earth's mass, and R is Earth's radius.

D. The formula -GMm(1/r₂ - 1/r₁) is more accurate than mg(r₂ - r₁) for potential energy differences.

ΔPE = -GMm(1/r₂ - 1/r₁)

The simple mgh formula is only accurate near Earth's surface.