Answer:
C. Tone and Volume
Explanation:
I think this way because when you talk about something serious, you dont talk like its not a serious matter or something that can be made into one. Its hard to mimic Tones and Volume if youre typing but, Imagine someone saying " Im sorry ma', but I cant support you staying in my home and my kids and wife too. " while saying it with a none serious voice.
( I had a longer explanation but Brainly keeps saying it had rude words )