What is the difference between
taxing
to regulate trade and taxing to raise
revenue?

Taxing to regulate trade is done to reduce the amount of a good that is purchased. Such taxes are usually higher than taxation for revenue as they are done to make the good so expensive that certain people will be unable to afford it. For instance, the alcohol levy of Botswana that was up to 40% at some point.

Taxation to raise revenue on the other hand, is not too high - as the government does not wat to restrict sales - and is simply imposed so the government can earn some revenue on goods sold. These can include Value Added Taxes for instance.

the china one is last

explanation:

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.