Without Air Resistance,a Projectile Fired Horizontally at 8 Km/s from Atop

Multiple Choice

Without air resistance,a projectile fired horizontally at 8 km/s from atop a mountain would

A) accelerate downward at g as it moves horizontally.
B) trace a curve that matches the earth's curvature.
C) return later to its starting position and repeat its falling behavior.
D) all of these
E) none of these