Manufacturing output in the nation of Okroshkia rose 4.9 percent in the year that ended in February, far more than they did in 12 months that ended in the previous quarter.
Meaning:
1. Manufacturing output in the nation of Okroshkia rose 4.9 percent
2. It did so in the year that ended in February
3. And this number - 4.9 percent - is higher in comparison with the previous quarter number.
Errors:
Attachment:
A.PNG [ 34.06 KiB | Viewed 4835 times ]
We have comparison question here, first of all we need to find

of comparison.
So what entities is being compared here?
Attachment:
heart of the comparison.PNG [ 25.5 KiB | Viewed 4841 times ]
But
'they' doesn't agree in number with
"Manufacturing output". So we have pronoun-antecedent agreement error.
Before to move on POE, let's analyze some splits here:
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greater vs more.PNG [ 18.67 KiB | Viewed 4837 times ]
For me this split between 'higher' and 'more' is not 100% decision point, both of the could be correct depending on the context, so let's move to more critical decision points.
'did' vs 'was/were'The main action verb in out sentence is
'rose' so we can replace it with
'did' but not with
'was/were"POE:
(A) more than they did(B) more than they were ([color=#ff0000]'they' doesn't agree in number with "Manufacturing output", 'were' cannot replace 'rose')[/color](C) more than it did(D) higher than (comparison fails here, now we are comparing "Manufacturing output in the nation of Okroshkia rose 4.9 percent in the year" with "in 12 months that ended in the previous quarter" illogical comparison)(E) higher than it was('was' cannot replace 'rose')Attachment:
C.PNG [ 33.95 KiB | Viewed 4810 times ]
C is the answer