Which sentence contains a nonessential adjective clause? a. the coach explained the rules that the officials revised in 2010. b. the coach who is an expert in the sport explained the revised rules to us. c. after explaining the rules to us, the coach released us to the field. d. the officials revised the rules, which the coach explained to us before practice.

D.

Explanation:

Nonessential clauses differ from essential clauses in their punctuation: when a clause is nonessential, it is set off from the main sentence with commas, and this means that the clause adds information about the noun it modifies but it is not essential in defining it or distinguishing it from other possible nouns.

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b. legendary founder of thebes