Answer: с. one weekend per month plus two weeks
Explanation:
As a reservist in the Navy, Kat will have to do 39 days of training each year. 15 of those days or two weeks, are for Annual Training (AT).
The 24 remaining days will be used for weekend drills. These 24 days will be condensed into 12 2-day weekends that will be performed one weekend a month for the year.