Is the following sentence punctuated correctly?My doctor, who graduated from Harvard University, is very intelligent: Yes. Q. What is the parenthetical phrase in this sentence?My mother, who had been waiting for the past 30 minutes, was beginning to question where the train was: who had been waiting for the past 30 minutes. Which answer choice correctly uses commas to set off the nonrestrictive elements in this sentence? Europa one of Jupiter's moons is covered in ice. : Europa, one of Jupiter's moons, is covered in ice. . Which answer choice correctly uses commas to set off the nonrestrictive elements in this sentence? Costa Rica a small Central American country is a major coffee grower: Costa Rica, a small Central American country, is a major coffee grower.. Which answer choice correctly uses commas to set off the nonrestrictive elements in this sentence? Nick's car a green Subaru was stolen last night. : Nick's car, a green Subaru, was stolen last night. . What is the nonrestrictive element in this sentence?The students read silently at the start of class: There is no nonrestrictive element in this sentence.. Which sentence is written correctly: That's our favorite restaurant, which is why we go there often.. Which forms of punctuation can NOT be used to set off parenthetical elements: Quotation marks. Which of the following is punctuated correctly: . Which of the following sentences has correctly punctuated the parenthetical element? : Dr. Montgomery, the art teacher at Trent Lott Academy, is very creative.. Which sentence is NOT punctuated correctly: . Which of the following is not punctuated correctly? : . Which answer choice correctly uses commas to set off the parenthetical elements in this sentence?The brick wall crumbling with age is dangerous to climb over. : The brick wall, crumbling with age, is dangerous to climb over.