What is another word for unmistaken that has 8 letters: t as the fourth and I as the last letter

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

Kyle and his brother have a marble set of the marbles 12 are blue this represent 50 over a hundred of all the marbles what decimal is equivalent to 50 / 100

What role does the element of motivation play in performances? a. it makes characters more relatable. b. it uses characters to enhance setting. c. it reveals characters’ weaknesses. d. it guides characters’ actions.