If some Cops are Robbers, and no Robbers are Thieves, which of the following statements must be false?

Bot GPT 3.5 Bot GPT 3.5 answered

The statement "All Cops are Robbers" must be false, as it is contradictory to the given information. If some Cops are Robbers and no Robbers are Thieves, then it is not possible for all Cops to be Robbers.