Answer:
D
Step-by-step explanation:
A and B are both wrong for the same reason. You are subtracting from 212 not subtracting 212. Make sure you read that carefully.
E must be in thousands of feet. The elevation must be E/1000 for either C or D to work. You are not trying to solve anything to do with the elevation. So C is wrong.
You are trying to do something about b when the elevation changes (upward).
The answer is D
