Final answer:
A Medicare prescription drug plan can reduce its coverage for a given drug during the first 60 days of the year if it can demonstrate that the change will result in savings for the plan and the Medicare program.
Step-by-step explanation:
A Medicare prescription drug plan can reduce its coverage for a given drug during the first 60 days of the year under certain conditions. The correct answer is a. If the Medicare prescription drug plan can show that reducing coverage early in the year will result in savings for the Part D plan and the Medicare program, generally the plan may make such a change.