Which is the best response to receiving a threatening text from a classmate? send a threatening text in reply, then block the phone number block the phone number, then contact his phone service provider immediately delete the text, then report the incident to authorities ignore the message, then get a new cell phone number

report the incident to authorities

Explanation:

When you are receiving a threatening text message from a classmate you need to report that to the authorities, not only school authorities but also other kinds of authorities, like police or even getting a restraint order depending on the severity of the threats that he is making, and to search for thebest way to protect youself.