Final answer:
Renewable energy is expected to have the highest rate of consumption by 2030, due to increased efficiency, cost-effectiveness, and environmental concerns. So the correct option is d.
Step-by-step explanation:
Based on the provided information, it's anticipated that renewable energy sources will have the highest rate of consumption by 2030. The data suggest a considerable growth in renewables due to efficiency improvements and cost reduction over time, increased awareness of global warming challenges, and a shift away from high carbon dioxide-emitting sources like coal. While natural gas consumption is also expected to rise, largely due to its role in replacing coal for electricity generation, the growth rate of renewable energy consumption outpaces that of natural gas and other fossil fuels.