The answer is B; Australia.

The Brumby is the free-roaming wild horse of Australia. Found all over Australia, most notably the Australian Alps, the Brumbies are descendents of lost or escaped horses that were brought over by the early settlers.
They are also mentioned in the first few lines of the poem The Man From Snowy River.

“The colt from old Regret had got away,
and had joined the wild bush horses.”

Running Brumby Horse