c) premolars and molars
The premolars and molars are specifically designed for crushing and grinding food. Their flat and broad surfaces allow them to effectively break down food into smaller particles, making it easier for digestion. Incisors, on the other hand, are primarily used for cutting, while canines are designed for tearing. Thus, when it comes to the function of crushing and grinding, premolars and molars are the teeth that are most suitable for this purpose.