Verbal communication includes

a. tone, pace, enunciation, and volume

b. posture, pace, tone, and volume

c. pace, volume, eye-contact, and tone

d. volume, mannerisms, enunciations

I'd choose C. Pase matters because if you talk too fast they may not understand. Volume because if you talk to loud they might think its important and panic or if not loud enough they might not hear. Eye contact is not needed but perferd. Tone to see if they are annoyed, sad, mad, happy or excited.