Which constitutional principle prohibits an individual state from declaring war?

What two things are being compared in this epic simile (the odysseus)

All of the following were weaknesses of the articles of confederation, except: a) the central government was not permitted to regulate state, interstate, or foreign trade. b) the central government was not permitted to borrow money. c) the central government had little ability to regulate money. d) the central government had no ability to tax.

What kind of organizations are supported by economic interest groups? a. civil rights organizations b. professional organizations c. womens' rights organizations d. business and trade organizations