Answer: b. premolar
Step-by-step explanation:
The primary dentition consists of twenty teeth in total. Such teeth are also known as deciduous teeth. These teeth are lost when the permanent teeth erupt. In both up and down side of the mouth, the teeth are 2 middle incisors, 2 lateral incisors, 2 canines, and 4 molars. The premolars do not erupt in the primary dentition instead they appear in the permanent set of teeth.