If this country wishes to move its output from point A to point B, what will be its opportunity cost? 30 units of Capital goods
30 units of Consumer goods
40 units of Consumer goods
60 units of Capital goods

30 units of consumer goods

Explanation:

this is because you can cancel the 40 units one because it says 40 units of consumer goods and point A is at 120 and point B is at 90 Subtract those you get 30 so eliminate the 40 unit one and the 60 unit capital good too Point A's capital is at 30 and Point B is at 60 so if you add those you don't get 60. the last one to eliminate is the 30 unit capital goods. Because you want to find the consumer goods instead.

answer; the confederacy could afford to move a large number of prisoners hundreds of miles but could not afford to fee and house the prisoners;

answer; substantive law;