It is B.wind because none of the others are really important  
        
             
        
        
        
Hi,
I can’t really answer the first question, but you should use a ruler to measure the length of the route and of the segment in blue and white in the lower right and then write a proportion. If you need help with that just let me know. The answer to the second question is summer monsoon, because as you can see the red arrows point to India from Africa, while the blue ones go the opposite direction.
Hope this helps! If I was not clear enough or you’d like further explanation please let me know. Also, English is not my first language, so I’m sorry for any mistake.
        
             
        
        
        
The approximate average ocean depth along the continental shelves bordering North America is 3958m. The average depth of the continental shelf, however, is 200m
        
             
        
        
        
Answer:
The mean center of population is the place where an imaginary, flat, weightless, and rigid map of the United States would balance perfectly if all residents were of equal weight. Historically, the movement of the center of population has reflected the expansion of the country, the settling of the frontier, waves of immigration and migration west and south. Since 1790, the center of population has moved steadily westward, angling to the southwest in recent decades.
SOURCE: Geography Division, "Centers of Population Computation for the United States 1950-2010," issued March 2011, available at www.census.gov/geo/www/2010census/centerpop2010/COP2010_documentation.pdf. Consulted for historical reference: Historical Atlas of the United States, National Geographic Society, 1988.
NOTE: The Proclamation Line of 1763 limited British settlement to areas east of the Appalachian Mountains. Alaska and Hawaii were not included in the calculation of the mean center of population until 1950. Puerto Rico was not included in any decade. For more information on the mean center of population, an animated map, and other resources. This graphic is adapted from the "Census Atlas of the United States" published by the Census Bureau in 2007. 
Explanation: