Question

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what does rifling cause the projectile to do?
drop
arch
spin
expand

Explanation:

Rifling refers to the spiral grooves inside a gun barrel. When a projectile (like a bullet) is fired through a rifled barrel, these grooves cause the projectile to spin. Spinning helps in stabilizing the projectile's flight, similar to how a spinning top stays upright. It improves accuracy and range. Dropping would be due to gravity, arching could be a trajectory aspect not directly caused by rifling, and expanding is usually related to the projectile's design upon impact (like in expanding - type bullets) rather than rifling.

Answer:

Spin