Anyone know the answer?

What was the main aim of the northwest ordinance of 1787

Firms use marginal analysis to determine prices by a) changing prices in accordance with information from retailers. b) using comparisons with strong competitors to position prices accordingly. c) examining the effect on revenue of small changes to the price of one item. d) trying to minimize production costs by using better and more efficient methods.

Carlos is looking at a picture of a convergent boundary on which a volcanic arc and a trench are identified. which type of convergent boundary is carlos looking st?