The diseases listed are MOST likely caused by a malfunction of the digestive system.
immune system.
nervous system.
skeletal system

I’m going to guess these are the choices: a) recreational skiing developed in the mid-19th century b) it was originally invented as a way of getting from place to place in snowy regions c) downhill skiing is currently the only common form of the sport d) it mostly evolved from snowshoeing- if that’s the cases then the answer would be c) downhill skiing is currently the only common form of the sport

His goal is  achievable, realistic, measurable, and time-based. : )

Narcotics treat pain so pain control is the answer