tbr battery question

[pizza1994]

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In an electrolytic cell, what must be TRUE about the cell and battery voltages?

a) both values are positive; Ebatery > Erxn
b)both values are positive; Ebatery < Erxn
c) Ebatery >0 and Erxn <0; Ebatery > Erxn
d) Ebatery >0 and Erxn <0;Ebatery < Erxn

answer= C

I dont get this...is there some sort of equation relating these voltages...?