Read the following context and choose the best option to answer the question.
Context: The astronauts did n't get paid extra for being astronauts -- they just got the salary that any other military officer of their rank got . Though space flight was temporary duty , which was paid per diem . The rate at that time was $ 25 per day , which would have been $ 275 for the 11-day mission . But since meals were furnished , that was deducted .
Question: How many days did the astronauts get paid 275 dollars for ?
Options: 
A. 12 days
B. 13 days
C. 10 days
D. 11 days


D