Question

Because of its geography Canada would be most likely to be affected by

Answer 1

hint: it could happen many places in North America.

So the answer would be forest fires.

more than half of Canada is covered by forest and woodland areas.

Answer 2

Are there any options?

Canada is far north, and it is thus likely affected by cold temperatures and connected to it low food production and the necessity of importing food. That's the best I can say without knowing if there are options!