【閱讀下圖表及短文，回答第31至32題】
Renewable energy in Taiwan includes solar energy. Solar energy comes from natural sources, renews quickly, and does not produce large amounts of greenhouse gases. When considering the transition to solar energy, it is important to weigh both the advantages and disadvantages. One major advantage of solar energy is that sunlight is plentiful and does not run out like natural gas or oil. Solar power can also help lower electricity bills. Besides, with owned solar panels, the property value can be increased. However, solar energy has some challenges. Since it depends on sunlight, we need battery storage systems to save the energy for cloudy days and nighttime. Although these systems are quite expensive, they provide limited energy storage. In addition, solar panels also require a lot of space, which can be a problem in crowded urban areas.

【圖表：Energy Supply in Taiwan from 2004 to 2024，折線圖顯示 Oil and Petroleum Products、Coal and Coal Products、Natural Gas、Nuclear、Renewable Energy 各能源來源的百分比趨勢】

31. According to the line chart, what is one trend in Taiwan's energy supply from 2004 to 2024?

(A) Energy generated by natural gas has gradually decreased for the last 20 years.

(B) Nuclear energy has accounted for more than 10% of the energy supply since 2004.

(C) Coal and coal products have been supplying about 30% of the total energy since 2004.

(D) Energy supplied by oil and petroleum products has steadily increased over the past 20 years.