Concept:The phrase "there are no flies on the boss" is an idiom that describes someone who is clever and alert.
Explanation:This expression means the boss is not slow or careless.
It shows that the boss cannot be easily tricked or deceived.
A person with "no flies" on them is sharp, watchful, and quick to understand things.
This is the opposite of being gullible, because a gullible person trusts others too easily.
It does not mean strict or neat in this context.
Among the options given, "smart" is the best interpretation.
Answer:B. smart