Question $6($Mandatory$)(1$ point$)$

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An air$-$filled parallel$-$plate capacitor has a capacitance of $1$ pF $.$ The plate separation is then doubled and a wax dielectric is inserted, completely filling the space between the plates. As a result, the capacitance becomes $2$ pF $.$ The dielectric constant of the wax is:

$8\mathrm{.}0$

$4\mathrm{.}0$

$0\mathrm{.}25$

$0\mathrm{.}5$

$2\mathrm{.}0$