Read the following context and choose the best option to answer the question.
Context: Because of the difference in lifestyles between Europe and the US , moving to America was challenging . First of all , the formal English which I had learned in school did not help me in the play yard in making contact with other students . Although we had some distant family that helped us out once we actually got here , to me it still felt like we were in the middle of nowhere for quite a time .
Question: When must have I moved to the US from Europe ?
Options: 
A. I must have moved when I was in elementary school .
B. I must have moved when I was in college .
C. I must have moved when I was in middle school .
D. I must have moved when I was in high school .


A