The choice that would likely have the smallest impact on climate change would be buying apples from farms that plan to use organic practices. While organic farming can have various environmental benefits, such as reduced chemical use, it does not necessarily guarantee lower greenhouse gas emissions compared to conventional methods.
In contrast, the other options—no packaging, locally grown apples, and buying in bulk—directly address the carbon footprint associated with transportation and packaging, which can have a more immediate effect on climate change.
Thus, focusing on transportation related to fruit distribution (locally grown apples and buying in bulk) or reducing waste (no packaging) would typically have a greater impact on mitigating climate change than the specific choice of organic farming methods.