Neutrality, meaning stay out of foreign affairs besides trade.
A. Is correct, uses a free source or energy. Aka renewable source
B) they had some common cause or goal.
The effects of rising ocean levels on marine ecosystems would represent the widest study ie world wide because when the ocean rises it rises all over the world so therefore it will have an worldwide impact for example it may create shallow water marine environments where the coastal floodplains are inundated more by the oceans.
