The inference is that the change that should be made to the phrase "Although she remained completely unaware of it until her dying day is C. Change the period to a comma and add an independent clause at the end.
It should be noted that the inference is the conclusion that can be made based on the information that's given.
In this case, the inference is that the change that should be made to the phrase "Although she remained completely unaware of it until her dying day is to change the period to a comma and add an independent clause at the end.
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