Answer:
A longitudinal study
Explanation:
A longitudinal study can be used to discover relationships between variables that are not related to various background variables. This observational research technique involves studying the same group of individuals over an extended period.
Answer:
A and C are both long term challenges, I'm pretty sure it's A.
Explanation:
Personal experience, I have arthritis and it's a long term challenge.
It is used to reduce pain,fever and inflammation. Also used to decrease the risk of heart disease
