Standard electrode potential for ${\mathrm{Sn}}^{4+}/{\mathrm{Sn}}^{2+}$couple is +0. 15V and that for the ${\mathrm{Cr}}^{3+}/\mathrm{Cr}$ couple is - 0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be

• A

  +1.83 V

• B

  +1.19 V

• C

  +0.89 V

• D

  +0.18 V