Grammar is a language system. Grammar is commonly referred to be a language's "norms," but no language has norms*.
Why are rules important in sports?
Competition is governed by rules, which act as an understanding agreement. Regulations in sports outline what is and is not permitted to occur on and off the court. Everything from proper uniform wear to how to keep score throughout games of varying levels of play is governed by rules.
Thus, Rules is the correct option.
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