Witch of the sentences below uses the contraction it’s correctly?

Which three sentences in this excerpt from arthur conan doyle's "the contest" suggest that the author's tone is mocking?

Asap! : ( 20 points! cite textual evidence to support this analysis of the connection. a; he says that he chooses "to believe that there are insufficient finds in the great vaults of opportunity of this nation," so it shows that he has given up hope. b; he states, "so we've come to cash this check, a check that will give us upon demand the riches" of the nation for everyone. this proves that he wants government money to be equally shared. c; mlk explains that america should give african americans "a bad check, a check that has come back marked 'insufficient funds.'" d; he mentions that america wrote a bad check from freedom to african americans, but he states that he "refuses to belive that the bank of justice is bankrupt." he also states, "we've come to cash this or freedom and security of justice."

Which link would readers of this dictionary entry click if they wanted more information about the historical origins of the word language