Read the first paragraph of the article, "Kelvin Doe—A Young Engineer."
What central idea is presented in this paragraph?
a. A teenage boy, a DJ, and batteries have many similarities.
b. There is a small village in the Republic of Sierra Leone in West Africa.
c. Kelvin Doe, from West Africa, has many things in common with batteries and DJs.
d. Kelvin Doe changed the lives of the people in his community by his innovative thinking.