On average, individuals with a college diploma make $1 million more during their lifetimes than do individuals who do not earn a college diploma. Individuals who earn a college diploma are usually much more satisfied with the work they do on a daily basis because they find their work "more challenging" than those who do not earn a college diploma. College graduates are more likely to hold executive positions than individuals who do not graduate from college. Earning a college diploma generally makes work more profitable and more challenging, and allows for greater advancement. Sentence 4 is the that the writer of this excerpt reaches.

a. advantage
b. generalization
c. detail
d. introduction
e. conclusion