Read the extract and choose the right option.
Probably one of the oldest of all extreme sports, skydiving originated over 200 years ago. The sport has since evolved into jumping from an aircraft and doing a _____ of midair tricks before opening the parachute. Although it is a widely practiced sport, it still carries a considerable amount of risk and produces an adrenaline rush that is described as addictive.

• variety
• difference
• diversity
• distiction