Answer:
The correct option is April 2017-March 2018
Step-by-step explanation:
Since the company adopts a continuous quarterly budgeting,in 2017,the first revision and update would take place immediately after the first quarter.
The first quarter of the year ends on 31st March based on a January to December year end,the first revision and update would take 1st day of April 2017,hence the first revision and update would cover a one year period of April 2017 to March 2018,while the second update and revision would be expected July 2017 to June 2018