Answer:
Tariff of 40% on softwood imports from Canada
Who benefited?
A. U.S softwood producers
Explanation:
Basically, import tariffs are meant to discourage imports from a particular country with higher cost of importation. It is usually undertaken when you want to encourage local production of the commodity.
This of course depends on whether there are U.S. softwood producers. If there are, they would benefit tremendously with the significant rise in price caused by the tariff.
If there are not, then non-Canadian foreign softwood producers would benefit, assuming similar tariffs were not imposed on them. However, Canadian softwood producers would also benefit should they continue to export their softwood to the U.S. The losers would be the U.S. consumers, no matter the beneficiaries.