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