The choice that would have the smallest impact on climate change when purchasing apples at the store is:
buying apples from farms that plan to use organic practices.
While organic farming can have environmental benefits, it typically uses more land and can result in lower yields compared to conventional farming, which doesn't directly address transportation emissions and resource use like the other options. The other choices generally focus on reducing emissions associated with transportation and waste, which tend to have a more immediate impact on climate change.