Randall sustained phonation and in the middle chanced the configuration of his vocal tract. You measured a decrease in the frequency of formant 1. How did Randall change his vocal tract? A. His tongue...

Randall sustained phonation and in the middle chanced the configuration of his vocal tract. You measured a decrease in the frequency of formant 1. How did Randall change his vocal tract?

A. His tongue based moved upward.

B. His tongue base moved downard.