Answer: Kelvin Doe changed the lives of the people in his community by his innovative thinking.
Explanation:
Although the paragraph begins by inquiring about what a teenage boy, a DJ, and batteries have in common, the main point is not about their possible similarities, but about Kelvin Doe´s experience.
He was indeed from a small community in Sierra Leone, but he doesn´t share similarities with those items. The main pint is how his innovative thinking allowed him o help his community.
Kelvin Doe used garbage to built batteries, an FM transmitter, and started a radio station at only 15 years old.