The correct option is C Ameloblasts
In vertebrates, an odontoblast is a cell of neural crest origin that is part of the outer surface of the dental pulp, and whose biological function is dentinogenesis, which is the formation of dentine, the substance beneath the tooth enamel on the crown and the cementum on the root. Ameloblasts are cells present only during tooth development that deposit tooth enamel, which is the hard outermost layer of the tooth forming the surface of the crown. Osteoblast are cells with single nuclei that synthesize bone. However, in the process of bone formation, osteoblasts function in groups of connected cells. Dentoblast does not secrets enamel. Thus, option C is correct.