This one is tough but I'll go with C. I don't think Canada has any desserts since it's cold up there, so B and D are out. A doesn't state Tundra and both Canada and America have Tundra. America has Colorado, Montana, Wyoming, and Alaska as Tundra states. C has all 3. Canada may have tropical grasslands considering it is almost exactly in the northern hemisphere surrounded by water. Florida has tropical grasslands too. And of course both countries have grassy plains.