College graduates earn much more than grade school dropouts mainly because

A) the college graduate is older.
B) the college graduate has learned more.
C) the college graduate is probably smarter,richer,more motivated,has better connections,and comes from a more supportive learning environment.
D) the college graduate is more likely to have grown up in a large city,and to be more cosmopolitan.

Research shows that college graduates generally have better employment opportunities, higher salaries, and a greater potential for upward mobility in their careers. This is often attributed to a combination of factors such as their higher level of education, expanded skill sets, and access to job networks and resources. Additionally, growing up in a supportive learning environment and having access to resources and opportunities can also contribute to a college graduate's success compared to someone who dropped out of grade school. It is not necessarily true that college graduates are older or from a large city, nor does this automatically guarantee success.