Depression and suicide are more common in north america today than they were a century ago. but in both periods, pessimistic thinking and feelings of loneliness correspond to a heightened risk of depression and suicide. this best illustrates that play a role in depression and suicide in varied settings

I believe the answer is: Common underlying principles
Common underlying principles refer to the standard set of mind that we commonly use to approach a certain problem.
If an individual is used to look everything that happen in his/life postiively, that individual would less likely to develop suicidal thought regardless of his/her problems.

It’s either d or b ! but it might be b

The answer is d) political map are designed to show boundaries and territories.