Fluoride reduces caries activity by.. Enhances the precipitation of insoluble fluoroapitite into the tooth structure

Fluoride reduces caries activity by: 

a. Reduces bacterial adhesion and carbohydrate storage (antimicrobial activity). 

b. Enhances the precipitation of insoluble fluoroapitite into the tooth structure. 

c. Fluoride enhances remineralization of the noncavitated carious lesions. 

d. All of the above.

E. B & C. ***