A

Step 1: The absolute permittivity (\varepsilon) of a material is given by the formula:
\[\varepsilon = \varepsilon_0 \times \kappa\]
where \(\varepsilon_0\) is the permittivity of free space, and \(\kappa\) is the dielectric constant (relative permittivity) of the material.

Step 2: The value of \(\varepsilon_0\) is approximately:
\[\varepsilon_0 = 8.85 \times 10^{-12} \, \text{F/m}\]

Step 3: Given that the dielectric constant of water (\(\kappa\)) is 80, we can plug in the values:
\[\varepsilon = 8.85 \times 10^{-12} imes 80 \]

Step 4: Calculating \(\varepsilon\):
\[\varepsilon = 8.85 \times 10^{-12} \times 80 = 7.08 \times 10^{-10} \, \text{F/m}\]

Therefore, the absolute permittivity of water is approximately \(7.08 \times 10^{-10} \, \text{F/m}\).