The correct answer is (b). Biofuel is not always cost-effective. The production of biofuel can be expensive, and the cost of biofuel can fluctuate depending on the market price of the feedstock used to produce it. Additionally, the use of biofuel can sometimes lead to increased food prices, as land that could be used to grow food is instead used to grow biofuel crops.
(a) Biofuel is eco-friendly. Biofuels are renewable energy sources that can help to reduce our reliance on fossil fuels. They also produce fewer emissions than traditional gasoline and diesel fuels. However, the production of biofuel can sometimes have negative environmental impacts, such as deforestation and water pollution.
(c) Biofuel can contribute to remedy energy crisis. Biofuels can help to reduce our reliance on fossil fuels, which are a finite resource. They can also help to reduce our carbon emissions, which contribute to climate change. However, the production of biofuel can sometimes have negative environmental impacts, such as deforestation and water pollution.
(d) Biofuel is also made from corn. Biofuels can be made from a variety of feedstocks, including corn, soybeans, sugarcane, and algae. Corn is one of the most common feedstocks used to produce biofuel, but it is not the only one.