In cockroaches, food is crushed in which part of the body?

• Since cockroaches lack teeth, they have a muscle organ behind the crop for breaking and grinding food particles so they can be effectively digested. 
• This is a gizzard, also known as a proventriculus, and it has chitinous plates, which are hard structures that resemble teeth and are used for crushing and grounding food particles. 
• The food particles that the cockroach consumes are first kept in the crop before being moved to the gizzard, where they are fragmented into extremely minute pieces before being moved to the following sections of the alimentary canal to be broken down by enzymatic processes.

Hence, option B is the correct answer.