Final answer:
The bold appositive phrase 'the farmer Emily Fields' refers to the subject 'farmer', providing additional information about who the farmer is. The correct option is C.
Step-by-step explanation:
The bold appositive phrase in the sentence: "After a long day of milking cows, the farmer Emily Fields always makes fresh cheese," refers to 'the farmer Emily Fields'.
An appositive phrase is a noun or noun phrase that renames another noun right beside it.
In this case, the phrase 'the farmer Emily Fields' renames the subject 'farmer,' providing additional information about who the farmer is. The correct option is C.