Answer: A - Change the Subscription Prorate Precision in package settings to "Month + Day."
Explanation: From the question above, it is clear that the subscription is 1 Jan 2017 to 1 Jan 2018. Meaning its a year and a day. So for the subscription prorate calculation to be same as expected by the Admin, the setting in the package should be made to calculate both month and day as the subscription is 12 months and a day.