Which was an area of weakness in the federal governmemt under the articles of confederation?

The Articles of Confederation was a weak document in general.  The federal government was too weak to enforce laws and basically had no power.  Most of the power was in the States rather than the federal government.  Congress (legislative branch) was the only federal government under the Articles.  They had power to declare war, appoint military officers, sign treaties, make alliances, appoint foreign ambassadors, and manage relations with Indians.  The federal government didn't have the power to tax.  This power was left to the states.

spread of christianity

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.