Which statement best describes how James Cross Giblin creates the characters in his book?

James Cross Giblin shows what his characters are like by focusing on what other characters say about them.
James Cross Giblin shows what his characters are like by focusing on what his characters look like.
James Cross Giblin shows what his characters are like by focusing on what they say to other characters.
James Cross Giblin shows what his characters are like by focusing on what they think and do.