Read the passage. According to one study, by the year 2025, energy from renewable sources like wind and solar power will be cheaper than energy from coal.

Based on the information provided, what visual information would be most helpful to include with the passage?

a map showing current costs of energy
a chart showing expected world use of coal in 2025
a line graph showing expected changes in energy costs over the next 10 years
a set of photographs showing people using renewable energy in their homes and cars