Read the excerpt from Lee’s paper about the astronauts involved in the space race. These astronauts were in the Project Mercury program: Deke Slayton, John Glenn, Scott Carpenter, Gordon Cooper, John Glenn Jr., Gus Grissom, Walter Schirra, and Alan Shepard. Project Gemini had other astronauts: Edwin Aldrin, Neil Armstrong, and Michael Collins.

Which visual aid would be best for Lee to use to make the two lists of astronauts easier to understand?

a chart
a graph
a map
a model