The answer is a. correlational research.
In this scenario, you only do observation of one event and trying to find a link between them. This method is good for finding correlation, but not for causation.
Because you only observe the subject without intervention, it shouldn't be experimental research. What you observe is only one condition, so there is no control subject that get different condition.
The answer is contained in the attachent as the vulgarism cheker will not let me post it any other way.
Rheumatoid arthritis causes this. It's also a chronic disease.
A sprain is an injury to a ligament.
Osteoarthritis is a joint disease caused by the inflammation, breakdown and loss of the cartilage.
Anterior cruciate ligament damage is the injury to this ligament.
Hope this helps :).
In 1970 only about 20% of Psychology majors were women. In recent polls women now make up just over 70% of psychology majors. I would say the answer is False.