What is the effect of the chancellor of the exchequer entrance at the inn just after fisher says, "by jove! that's an idea. you're perfectly right. and that suggests a very queer idea, doesn't it? " a)it shocks readers by revealing a detail about fisher that he wants to hide. b)it builds suspense as readers are eager to know what idea it suggests. c)it introduces a flashback that explains exactly what killed the man. d)it adds a parallel plot line that casts doubt on fisher's honesty and innocence.