Cocklebur (Xanthium species) is primarily native to North America, but they are also found in parts of South America. The question asks about other regions where cocklebur is naturally found, and among the options given, "All of the above" is the best response as cocklebur can thrive in many regions, including Australia, India, and South Africa, even though they may not be native there. However, to clarify, they are not part of the native flora of those specific regions but can occur there.
So, the correct answer is All of the above.