The following sequences of reaction may be used to extract zinc from its sulphate are:
`Zns + O_(2) rightarrow ZnO + SO_(2)`
`ZnO + C rightarrow Zn + CO`
How many tonnes of Zn can be obtained from 10 tonnes of Zns assuming that the yield is 75%? [Atomic weight of Zn = 65, S = 231]
A. 5
B. 10
C. 12
D. 15