Considering the available options, the statement that is an excellent reason to use a style manual is "it makes it easy to communicate style peers in a particular subject area."
A style manual is considered a collection of standards used in creating, writing, and designing documents for general or special subjects, publications, disciplines, etc.
The purpose of the style manual is to ensure consistent style and format in publications generally.
Hence, in this case, it is concluded that the correct answer is "it makes it easy to communicate style peers in a particular subject area."
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