Of the four, probably Coconut, but use it sparingly and only on leather that has been hydrated with damp sponge and allowed to absorb, 15-20 minutes, probably a ¼ teaspoon or less.

You can use Olive oil, some well know leather carver/ saddle makers recommend Olive oil. Buy pure olive oil, that is not a mineral oil blend, read the label, also sparingly 4-5 drops at a time, wait a week or more between applications for fully hydration or you can tear the leather fibers.