Answer:
Option A
Explanation:
In a dry cell, zinc acts as a negative electrode.
In this cell , the outer zinc container is the negatively charged terminal
At anode (negative terminal)
$Zn(s)\rightarrow Zn^{2+}(aq)+2e^{-}$
At cathode (positive terminal)
$2MnO_{2}(s)+2e^{-}+2NH_{4}Cl(aq)\rightarrow Mn_{2}O_{3}(s)+2NH_{3}(aq)+H_{2}O(l)+2Cl^{-}$
