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Which of the following revisions of sentence 13 shows an example of a properly punctuated nonrestrictive clause?
(A) The Lyndon High School Skate Club, that is an extracurricular activity at our school, would like to offer the city some help.
(B) The Lyndon High School Skate Club, who is an extracurricular activity at our school, would like to offer the city some help.
(C) The Lyndon High School Skate Club, which is an extracurricular activity at our school, would like to offer the city some help.
(D) The Lyndon High School Skate Club, an extracurricular activity at our school would like to offer the city some help.
What is (C) The Lyndon High School Skate Club, which is an extracurricular activity at our school, would like to offer the city some help.