The last answer would be considered to be genetic engineering
Explanation:
What the farmer is doing is selective breeding by crossing a plant with desirable traits to another plant with other desirable traits so that the result would eventually display a combination of both features. This is manipulating the genetic makeup of the flower's offspring. Number two and three are naturally occurring. For the first one's case, it does not necessarily manipulate the object's genetic makeup. Hope this helps :) Soz if I'm wrong
