To find out how many minutes Caitlyn read, we can calculate the time difference between 9:45 am and 10:37 am.
- From 9:45 am to 10:00 am is 15 minutes.
- From 10:00 am to 10:37 am is 37 minutes.
Now, we add the two time intervals together:
15 minutes + 37 minutes = 52 minutes.
Therefore, Caitlyn read for 52 minutes.
The answer is C. 52 min.