Answer:
3. impolite
Step-by-step explanation:
Interrupting a speaker isn't so bad that it's vicious.
Guilty doesn't fit within this sentence grammatically.
Reckless, in terms of definition, isn't the best answer/doesn't fit for this sentence.
It is impolite to interrupt a speaker. You're supposed to be silent until they are done speaking.
Thus, the best answer is 3, impolite.
hope this helps :)