- A) Bio-fuel is eco-friendly: While the "eco-friendliness" of biofuels is debated (lifecycle emissions, land use change, water usage), they are generally promoted as having lower net carbon emissions compared to fossil fuels and being a renewable resource. So, stating it is eco-friendly is often presented as a benefit, though with caveats. - B) Bio-fuel is cost-effective: Biofuel production costs vary depending on feedstock and technology. Often, biofuels are not cost-competitive with fossil fuels without government subsidies or mandates. High production costs remain a significant challenge for widespread adoption. Therefore, this statement is generally not correct. - C) Bio-fuel can contribute to remedy energy crisis: Biofuels provide an alternative source of energy (particularly for transportation), helping to diversify energy supply and potentially reduce dependence on fossil fuels, thus contributing to energy security and potentially mitigating aspects of an energy crisis. This statement is correct. - D) Bio-fuel is also made from corn: First-generation biofuels like ethanol in the United States are primarily produced from corn. This statement is correct. - The statement that is generally not correct or is highly debatable without context (like subsidies) is that biofuel is cost-effective.