Answer:
The correct answer is C. 20
Step-by-step explanation:
Primary dentition is also called deciduous teeth, milk teeth or baby teeth. The primary dentition contains 20 teeth 10 on upper side 10 on lower which contains 4 molar, 2 canines and 4 incisors containing two central and two lateral incisors.
Central incisors appears between 6-12 months then lateral incisors comes between 9-16 months. First molar comes in between 13-19 months and second molar comes in 25-33 months. Canines comes between 16-22 months. These teeth are lost between 6-12 years and permanent teeth takes their place.