Read this excerpt from Leah Missbach Day’s foreword to Wheels of Change.

It is a challenge for many African girl students to remain in school. A myriad of obstacles often stand in their way. They have so many chores to do in the morning they often cannot get to school or start their lessons on time. Or, their parents need them to take care of younger siblings while they go work in the fields—a job they would never bestow on their boy children. It used to take Lewanika an hour to walk to and from school. Now her biking commute is 20 minutes. Lewanika is able to get her chores done, make it to school on time, and feel refreshed enough to pay attention in class.

What is the central idea of the excerpt?

a
African girls are not educated as well as their boy peers.
b
The chores assigned to African girls hinder their ability to go to school.
c
Bicycles enable African girls to attend school despite their busy schedules.
d
Commuting to school and work by bicycling is becoming an African tradition.