Read the passage " the man who knew too much" follows the protagonist , fisher , and his friend, march , as they solve crimes in london . due to his political connections , fisher is burdened by his knowledge of the secret motivations behind public crimes , fisher solves murders only to watch the murderer go free due to political corruption

what is the effect of the chancellor of the exchequer entrance at the inn just after fisher says"by jovel 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 adds a parallel plot line that cast doubt on fishers honesty and influence
c: it builds suspense as readers are eager to know what idea it suggests
d: it introduces a flashback that explains exactly what killed the man