Increase of greenhouse gases is warming the oceans and melting sea ice at the poles. Map of North America with five labeled cities. City A, Ottawa, Ontario, is located at 45 degrees N latitude, less than 100 kilometers from Lake Ontario to the west and more than 500 kilometers from the Atlantic Ocean to the east. City B, Miami, Florida, is a coastal city located at 25 degrees N latitude. City C, Mexico City, Mexico, is located at 19 degrees N latitude, several hundred kilometers from the nearest coast. City D, Denver, Colorado, is located at 39 degrees N latitude, more than 1,000 kilometers from the nearest coast. City E, Fairbanks, Alaska, is located at 64 degrees N latitude, approximately 500 kilometers from the nearest coast.

Which North American city located on the map above would be most directly affected by melting polar ice caps caused by climate change?

A (Ottawa, Ontario)
B (Miami, Florida)
C (Mexico City, Mexico)
D (Denver, Colorado)