# $NaOH$(aq base) was added to an aqueous HCl solution gradually and the conductivity of solution was measured.The plot of conductivity vs volume of NaOH added

$H^+$ and $OH^-$ ions has greatest conductivity.When initially they are reacting even though salt formed but still conductivity decreases till equivalence point after that no further neutralization and as $[OH^-]$ increases conductivity increases.
Hence (c) is the correct answer.