Which statement is true about how globalization has affected American workers?

a) The only jobs that have been lost or will be lost are blue-collar factory jobs.

b) Most workers who have lost their jobs because of globalization have ended up in better paying jobs.

c) Until now a relatively high proportion of Americans performed high-skill, well-paying jobs, while a relatively high proportion of Chinese performed low-skill, poorly paying jobs.

d) Globalization cannot be considered a threat to the livelihoods of highly skilled, well-paid American workers.