The coach yelled, "Run faster!" from the sidelines.
Correct: D
Option D correctly places the exclamation point inside the closing quotation mark because it is part of the direct quote. A comma also correctly separates the introductory phrase 'The coach yelled' from the direct quotation. Option A lacks the introductory comma. Option B incorrectly places the exclamation point outside the quotation marks. Option C omits the exclamation point from the quote and incorrectly places it at the end of the sentence.