Answer:
The two reduction reactions are
ZnO(s) + C(s) 
Zn(s)
+ CO(g)
ZnO(s) + CO(g) Zn(s)+CO2(g)
In the first case,
there is increase in the magnitude of 
°
while in the second case, it almost remains the same. In other words, will have
more negative value in the first when C(s) is the reducing agent than in second
case when CO(g) acts as the reducing agent. Therefore, C(s) is a better
reducing agent.
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