Which of the sentence contains a correctly punctuated parenthetical phrase? She played my favorite piece Beethoven's "Fur Elise."

Dr. Jonas Salk, a medical researcher from New York, developed the first effective polio vaccine.

My brother, the brightest kid in the class wasn't paying attention.

The dentist prepared to extract, the decaying tooth my left rear molar.

The last one

Explanation:

First one is not punctuated correctly

Second is appositive

Third is appositive

Fourth is the only one that makes sense

The answer is C, "Dr. Jonas Salk, a medical researcher from New York, developed the first effective polio vaccine."

Explanation:

The other answers are not punctuated correctly. The first one should have a comma after "piece", the third one should have a comma after "class", and the fourth one shouldn't have a comma at all.

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.