Discussion
Changing the order of integration is worth doing chiefly when
Answer: A
The classic case is \( \int_{0}^{1}\!\int_{x}^{1} e^{-y^{2}}dy\,dx \), where the inner integral cannot be done in the order given but becomes elementary when reversed. With a rectangle and constant limits the order makes no difference to the difficulty, so there is nothing to be gained by swapping
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