AP HUMAN GEO QUESTION (ap human geography interactive map journal unit 2)

how do I answer this question?

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

True or false.the baltic states have taken steps to diversify. or decrease the variety of their industries

[bws.05]where would uncharged particles be most likely found in an atom? o on the electrons o inside the protons o inside the nucleus outside the nucleus