If your friend speaks very quickly, running her words together as she talks, she is speaking at a fast:
question 4 options:
a)
rhythm.
b)
rate.
c)
cadence.
d)
convergence.

C. cadence

Explanation: ca·dence

/ˈkādns/

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noun

1.

a modulation or inflection of the voice.

"the measured cadences that he employed in the Senate"

synonyms:rhythm, tempo, meter, measure, rise and fall, beat, pulse, rhythmical flow/pattern, swing, lilt, cadency; More

2.

a sequence of notes or chords comprising the close of a musical phrase.

"the final cadences of the Prelude"

intonation based on rhythm.

for example: in, he, a,from