Please help me out for 10 points and a Brainliest!

What is the most likely reason it was difficult to pass laws under the Articles of Confederation?


Select one or more:

a. Americans were content to follow British laws.

b. The government did not have a legislature.

c. Passage required the votes of 9 of the 13 states.

d. Passage required a unanimous vote of the 13 states.