Keyuna just graduated high school and is set on a career that will earn her middle-class wages or higher. Which of the following would be the greatest barrier for Keyuna in succeeding in a career with the potential to earn middle-class wages?

a. being the youngest child among her siblings
b. getting poor grades in reading and mathematics during high school
c. having no extracurricular activities on her résumé
d. getting poor grades in social studies

Answer: B