Identify yourself.
Show yourself.
Open up.
<u>Answer:</u>
Stop [!] the train is approaching.
<u>Explanation:</u>
The punctuation should be an exclamation point because it used at the end of a sentence or a short phrase which expresses very strong feeling.
<em>Hoped this helped.</em>

The first choice has the most reasonable and backed up claim.
Answer:
no idea sorry,.........I am not of this level