Which of the following forces us to choose among alternatives?

The symmetry-integration diagram shows a set of situations under which a nation should fix or float. There is a set of combinations of integration and symmetry beyond which the benefits of fixing outweigh the costs. This is shown as:

A) a positively sloped line from the origin, equidistant from both axes. B) a negatively sloped line, above which a nation should fix and below which a nation should float. C) a curved line that follows a random path through the space, coming close but never touching either axis. D) a curved line, the slope of which is at first negative, then increases at an increasing rate as the benefits of fixing increase exponentially

Suppose the airplane market is an oligopoly. According to the figure above, the price can range as high as ________ and as low as ________

A) $13 million per plane; $1 million per plane B) $30 million per plane; $13 million per plane C) $13 million per plane; $13 million per plane D) $1 million per plane; $1 million per plane E) None of the above answers is correct.