Railroad tracks being blown up, skyline with smoke

How can the tone of voice change the meaning of 'yeah.' and 'No.'?

• It can make them sound more positive

• It can change them to sarcastic

• It can indicate seriousness

• All of the above

What are some possible reasons for someone to say 'No.'?

• To express disagreement

• To indicate a lack of interest

• To refuse a request

• All of the above