Read the excerpt below and answer the question.
and at last they took a change and begun to lay their heads together in the wigwam and talk low and confidential two or three hours at a time. jim and me got uneasy. we didn't like the look of it. we judged they was studying up some kind of worse deviltry than ever. we turned it over and over, and at last we made up our minds they was going to break into somebody's house or store, or was going into the counterfeit-money business, or something.
this excerpt signals a change in the novel's
a.)purpose
b.)theme
c.)tone
d.)viewpoint