[ 55 ] Earth and Space Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Information about five different fuel sources is listed in the following table. Energy Content (kJ/g) CO Released (mol/10 3 kJ) 2 Hydrogen 120 0 Natural gas 51.6 1.2 Petroleum 43.6 1.6 Coal 39.3 2.0 Ethanol 27.3 1.6 Which factual statement is supported by the data in the table? A. All cars will be fueled by hydrogen cells in the future. B. Petroleum is a better fuel source for cars than ethanol. C. Natural gas is too expensive to use as a fuel source for cars. D. Ethanol fuel provides a car with less energy per gram than petroleum.