What does "jump altitude" influence in skydiving?

Jump altitude plays a significant role in influencing the freefall experience and the time available for freefall before the parachute is deployed. Higher jump altitudes provide a longer period of freefall, allowing skydivers to experience the sensation of falling longer and perform more complex maneuvers or formations if they are in a group.

Additionally, the jump altitude dictates the minimum necessary altitude for safe parachute deployment. Skydivers must know their altitude to ensure they pull their parachutes at a safe height, allowing adequate time for the parachute to fully deploy and stabilize before they reach the ground.

The other options do not accurately capture the primary effects of jump altitude in skydiving. For instance, while altitude can influence the types of parachutes used, it's not the main factor; various designs accommodate different jump conditions. The jump order is typically dictated by factors like experience levels and equipment types rather than altitude alone. Lastly, while jump altitude might affect visibility to some extent, it is not the primary consideration in skydiving calculations and decisions.