Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

In recent years, renewable energy has become an increasingly important part of the global energy landscape. Solar and wind power, in particular, ___(1)___. These technologies have rapidly advanced, with solar panels and wind turbines becoming more efficient and affordable. ___(2)___.
One of the driving forces behind this shift toward renewable energy is the need to address climate change. Due to increased awareness of environmental issues, governments and private companies are working together to reduce carbon emissions. Additionally, renewable energy sources offer a much cleaner alternative to coal, oil, and natural gas, ___(3)___.
Despite the growth of renewable energy, challenges remain. One major obstacle is the intermittency of solar and wind power, which makes it difficult for regions lacking consistent sunlight or wind. ___(4)___.
Another challenge is the initial cost of building renewable energy infrastructure. This high initial cost may discourage some investors, but in the long term, the benefits of renewable energy, including lower energy costs and reduced environmental impact, make it a worthwhile investment. Driven by advancing technology and rising global demand for clean energy, ___(5)___.