Answer:
<u>Quoting respected people is one way Al Gore supports his points about the environment.</u>
Explanation:
On December 2007 Al Gore held his Acceptance Speech for receiving the Nobel Peace Prize. In his speech he quotes several well-known and respected people like Winston Churchill, Mahatma Ghandi, George Orwell, etc. to strengthen his plea for a better handling of the environmental issue.
It is d. when a character, place, thing, or event in a literacy work stands for a larger idea