The option that best explains some of the powers granted to Congress by the Articles of Confederation is:
Congress could declare war, make treaties, create a mail delivery system, and print money.
Under the Articles of Confederation, Congress had the authority to manage foreign relations, including declaring war and making treaties, as well as handling certain logistical functions like postal services and currency. However, the Articles did not grant Congress the power to raise taxes or create a national bank, which limited its effectiveness.