Rhonda's voice was cracking while she was presenting her ideas for the new ad campaign.This led several of her coworkers to wonder if she was uncertain or nervous.In non-verbal communication,the tone and volume of her voice refers to:

A) chronemics
B) semantics
C) proxemics
D) para-language

The tone and volume of Rhonda's voice are examples of para-language, which refers to non-verbal aspects of speech such as pitch, tone, volume, and vocal cues. Chronemics relates to the use of time in communication, semantics relates to the meaning of words, and proxemics relate to physical space and distance.