<span>The correct answer is C. Quotation marks are always used in pairs. A is incorrect, because titles can also be italicized rather than marked with quotations, depending on the piece. B is incorrect, because they are indeed used for citing someone's exact words. D is incorrect, because italics are more often used to emphasize a word. </span>
Wood: Combustion reaction converts chemical energy into light and heat. Petroleum: Can be burned to release light and heat or changed into another form of chemical energy, such as gasoline. Chemical batteries: Store chemical energy to be changed into electricity.
