In Chapter 21 of To Kill a Mockingbird, the author best reveals the intensity of Jem's belief that the jury will find the defendant, Tom Robinson, not guilty by _____.

a. enumerating Jem's understanding of the legal definitions of the crime
b. describing Jem's actions, including that he was jumping in excitement
c. reflecting Jem's optimism by his repetition of positive, enthusiastic responses
d. showcasing Jem's ability to form an argument similar to his father, Atticus