Where is the largest population concentration in the Western Hemisphere?

a. in the interior of Mexico
b. along the Brazilian coast
c. on the northeast U.S. and southeast Canadian seaboards***
d. in the southern half of California

on what?

The largest population concentration in the Western Hemisphere is on the northeast U.S. and southeast Canadian seaboards.

The largest population concentration in the Western Hemisphere is on the northeast U.S. and southeast Canadian seaboards. To arrive at this answer, we must analyze the population distribution across the continents of North and South America.

First, let's examine the options given:
a. In the interior of Mexico: While Mexico has a sizable population, it does not have the largest concentration in the Western Hemisphere.
b. Along the Brazilian coast: Brazil has a significant population, but it does not have the largest concentration in the Western Hemisphere.
c. On the northeast U.S. and southeast Canadian seaboards: This option is correct. The region comprising cities like New York, Boston, Philadelphia, Toronto, and Montreal has the highest population concentration in the Western Hemisphere.
d. In the southern half of California: While California has a dense population, it is not the largest concentration in the Western Hemisphere.

Therefore, the correct answer is c. on the northeast U.S. and southeast Canadian seaboards.

I agree.