Answer:
a. all of the above
Explanation:
The computation of yield is shown below:
For October:
= Output of October Ć· Input of October
= 45000 Ć· 46000
= 0.98
For November:
= Output of November Ć· Input of November
= 56000 Ć· 64000
= 0.88 approx
By computing above, we concluded that the yield is deteriorating due to which the loss cause should be investigated