Final answer:
Option 2: "The novel describes Jud as a 'kid with a troubled past and a cheerful heart.'" is the correct usage of quotation marks, as it provides a direct quote from the novel about the character Jud.
Step-by-step explanation:
When integrating a direct quote into your writing, it is essential to use quotation marks correctly to indicate the precise words taken from the original source. In the context of the novel about a boy named Jud, the sentence that correctly uses quotation marks to show a direct quote would be Option 2: "The novel describes Jud as a "kid with a troubled past and a cheerful heart."" This usage is appropriate because it captures the exact phrase as it appears in the novel, which provides specific and vivid detail about Jud's character, thereby supporting your text with accurate evidence.