Which Is a Valid Counterargument to the Call for Higher

Which is a valid counterargument to the call for higher tariffs to save Canadian jobs?

A) the need to protect Canadian workers from the dumping of foreign products
B) strategic trade policy calls for equal treatment of all trading nations so that they will have the same competitive conditions
C) Canadian firms and workers must be protected from the ruinous competition of nations where wages for workers are low
D) imports may eliminate some Canadians jobs, but they create others, so they may have little or no effect on employment