Question

What does intonation refer to select one of the options below as your answer:a. the change in the pitch (high or low sound of the voiceb. the rate of speed at which a poem is readc. the flow of apoem's stressed or unstressed syllablesd. the emphasis of words through a change of pace?

Answer 1

I associate "Tone" with sound frequencies. Tonic solfa being a music example which is basically, I think, using a certain musical key signature such as C major. In a major scale the sequence of "musical intervals" (ie frequency steps) is  key note TONE TONE SEMITONE ... TONE TONE SEMITONE.octave higher than keynote.
So, I'd go for a here.