Aspen or Cottonwood trees, somewhere in Canada

This photo was taken somewhere in British Columbia, Canada. I know where, but I’m not telling. :) The thing I don’t know is whether these trees are Aspen or Cottonwood or White Birch. I suspect that they are White Birch or Paper Birch, but I could easily be wrong, as I haven’t looked into it much, and didn’t ask any of the locals.