Answer:
D.drops the current month or quarter and adds a future month or quarter as the current month or quarter is completed.
Step-by-step explanation:
A continuous (rolling) budget is one that varies over time. It attach another month to the end of the budget as one month expires. for example, If initial budget covers the months of January to December 2018, then you may add January 2019 after January 2018 has ended.
Hence, option D is the correct answer.