The most common is Chicago style.
A) It's every man for himself around here.
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The detail "...make sure they are not touching each other..." best supports the inference that one bad apple can spoil all the others. As stated in the text, the fruits are stored in the hoard house for future consumption. It is important that one does not contain a bruise since this will also affect the others around it.
The answer is C) cause and effect because if it explores the relationship between and action and it's consequences you would be talking about a cause and then it's effect of what happened.