Option 1 -> "Hand out" means to distribute or give something to others, not to submit.
Option 2 -> "Hand off" means to pass something to another person or transfer responsibility.
Option 3 -> "Hand in" means to submit or give work to a teacher or authority figure.
Option 4 -> "Hand up" is not a standard phrasal verb in this context.
Hence, Option 3: hand in -> This is the correct phrasal verb used when students need to submit their completed work to their teacher before a deadline -> correct