**Core Concept**
Fluoride's primary mechanism of action on topical application involves the inhibition of acid production in dental plaque, thereby preventing tooth decay. This process is primarily mediated through the reduction of enamel mineral loss due to acid erosion.

**Why the Correct Answer is Right**
The correct answer is through the inhibition of **enzymatic hydrolysis of ATP** by fluoride ions (F-), which in turn reduces the activity of the **glycolytic pathway** in bacteria. This results in decreased production of lactic acid and other organic acids, ultimately reducing the pH and acid erosion of tooth enamel. The fluoride ion also promotes the **remineralization** of tooth enamel by inhibiting the dissolution of calcium and phosphate ions.

**Why Each Wrong Option is Incorrect**
**Option A:** Fluoride's primary mechanism of action is not through the inhibition of bacterial growth, although it does have some antimicrobial properties.
**Option B:** Fluoride's mechanism does not primarily involve the formation of fluorapatite, which is a secondary effect of long-term fluoride exposure.
**Option C:** Fluoride's mechanism of action does not primarily involve the inhibition of acid production through the reduction of glycolysis, although this is a contributing factor.

**Clinical Pearl / High-Yield Fact**
It's essential to note that topical fluoride applications can be either in the form of varnishes, gels, or foams, and the concentration of fluoride can vary depending on the application method and duration.

**Correct Answer:** C. Inhibition of enzymatic hydrolysis of ATP.