The best explanation of the benefits of the Articles of Confederation from the options provided is:
The Articles of Confederation contributed to an increasing sense of national unity.
While the Articles had several weaknesses, one of their benefits was fostering a sense of unity among the states, as they collectively worked together through a central government, albeit a weak one. The other options incorrectly represent the Articles' structure and limitations, as they primarily provided power to the states rather than the national government, and did not establish a strong executive or judicial branch.