Which of the following best describes the method of vehicle transport that is the most environmentally sustainable? A The use of a vehicle powered by hydrogen fuel cells because there are no carbon emissions B The use of a plug-in hybrid vehicle because the fuel sources do not release any carbon dioxide C The use of a vehicle powered by biociesel because it can be used in conjunction with traxitional diesel D The use of a vehicle powered by ethanol because corn is grown to produce anergy rother than for human consumption

## Step 1<br />The question is asking us to identify the most environmentally sustainable method of vehicle transport among the given options. <br /><br />## Step 2<br />Option A suggests the use of a vehicle powered by hydrogen fuel cells. This is a zero-emission vehicle, meaning it does not produce any carbon emissions. This is because the hydrogen fuel cell vehicle uses hydrogen as a fuel, which produces electricity to power the motor, with water and heat as the only by-products.<br /><br />## Step 3<br />Option B suggests the use of a plug-in hybrid vehicle. While these vehicles do not release any carbon dioxide when running on electricity, they still produce carbon dioxide when running on gasoline. Therefore, they are not as environmentally friendly as hydrogen fuel cell vehicles.<br /><br />## Step 4<br />Option C suggests the use of a vehicle powered by biodiesel. While biodiesel is a renewable energy source, it is not as clean as hydrogen fuel cells. Biodiesel can produce particulate matter and nitrogen oxides, which can contribute to air pollution.<br /><br />## Step 5<br />Option D suggests the use of a vehicle powered by ethanol. While ethanol is a renewable energy source, it is not as clean as hydrogen fuel cells. Ethanol can produce particulate matter and nitrogen oxides, which can contribute to air pollution.