Under today's farm policy, what happens if the market price of farm products falls below the support price? A. Farmers export more of their products.
B. Many farmers lose their farms to bankruptcy.
C. Farmers sell as much as they can on the market.
D. Congress buys farmers' crops.

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?