Organism involved in smooth surface caries is____________?_x005F_x000D_1 Streptococcus mutans_x005F_x000D_2 Actinomyces viscosus_x005F_x000D_3 Lactobacillus_x005F_x000D_4 Campylobacter

• A. only 1
• B. only 2
• C. 1 and 3
• D. All of the above