Hearing Aid Batteries Utilize a Zinc/air Electrochemical Cell $~~~~~~~~$ -1249 V $~~~~~~~~$

Hearing aid batteries utilize a zinc/air electrochemical cell. The reduction half-reactions and standard reduction potentials for this cell are given below. What is the standard cell potential of a zinc/air cell? $~~~~~~~~$ -1.249 V $~~~~~~~~$ +0.401 V

A) (-0.848 V)
B) (+1.500 V)
C) (+0.848 V)
D) (+1.650 V)
E) (-1.650 V)