The negative $\mathrm{Zn}$ pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by $0.13 \mathrm{~g}$ in 30 minutes. If the electrochemical equivalent of $\mathrm{Zn}$ and $\mathrm{Cu}$ are $32.5$ and $31.5$ respectively, the increase in the mass of the positive Cu pole in this time is

• A

  $0.180 \mathrm{~g}$
• B

  $0.141 \mathrm{~g}$
• Correct answer
  C

  $0.126 \mathrm{~g}$
• D

  $0.242 \mathrm{~g}$

Hence, the correct answer is option: 'C'.