Consider the following statements.
I. In dry cell, a moist paste of NH₄ Cl and ZnCl₂ is present in between the electrodes.
II. Ammonia gas is produced in Leclanche cell.
III. A part of KOH and ZnO is used as electrolyte in mercury cell.
True statements are

• A

  I and II

• B

  I and III

• C

  II and III

• D

  I, II and III