The correct option is A thecodont
In the thecodont type of dentition, teeth are embedded in the sockets in the jaw bone.
Diphyodont means two sets of teeth appear during the lifetime. One set of teeth is called milk teeth and they are temporary. The other set of teeth is permanent.
Heterodont means there are more than one type of teeth. Different types of teeth include incisors, canines, premolars, and molars.
Monophyodont means one set of teeth appears during the lifetime.