Answer:
The cost of paper shall be accounted in February in Year 2
Explanation:
The matching principle clearly states to match all the revenues against expenses. Here, the revenue is recognized in the month of February in Year 2 accordingly, the revenue is related to that period and thus cost shall be recognized at that time only.
In the month of January when paper is purchased it shall be recorded as part of inventory, and shall be charged as cost in income statement only when it is utilized for creating finished good, and generating revenue.