Answer:
C. Since the measurements were made in 1988, they are not necessarily representative of the current population of all women in the country's military.
Explanation:
As we can see from the data mentioned in the question that the population contains a sample of women age in 1988 only that represents measurements were made in the year 1988. Also, The current population of all women in the military countries is not generally representative
Hence, the correct option is c.