$A$ force $F$ acts between sodium and chlorine ions of salt (sodium chloride) when placed $1 \ cm$ apart in air. The permittivity of air is $\varepsilon_0$ and the dielectric constant of water is $K$. When a piece of salt is placed in water,the electrical force acting between sodium and chlorine ions $1 \ cm$ apart is:
- A$\frac{F}{K}$
- B$\frac{FK}{\varepsilon_0}$
- C$\frac{F}{K\varepsilon_0}$
- D$\frac{F\varepsilon_0}{K}$
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