The dielectric constant of ${\mathrm{H}}_2\mathrm{O}$ is 80. The electrostatic force of attraction between ${\mathrm{Na}}^{+} \mathrm{and} {\mathrm{Cl}}^{-}$ will be

• A

  reduced to 1/80 in water than in air

• B

  reduced to 1/40 in water than in air

• C

  will be increased to 80 in water than in air

• D

  will remain unchanged