The correct option is D Look out! The
According to general rule, an exclamation mark is used after an interjection or exclamation to indicate strong feelings or high volume, or to show emphasis, and often marks the end o a sentence. is used to mark the end of a complete sentence.
Exclamation marks are occasionally used mid sentence with a function similar to commas, for dramatic effect. Thus, the correct answer will be Option D, in place of the comma.
The remaining options are incorrect, as a comma is used to indicate a pause whereas, a semi colon is used to separate major sentence elements. A period is used to mark an end to a complete sentence.