2. Illustrated in the figure below are the alveolar pressure records obtained for two separate productions of the vowel /a/ (A and B). Superimposed on these pressure data is the speakers presumed relaxation pressure curve.

The graph is a volume-pressure diagram showing lung volume (in % VC) vs. pressure (in cm H₂O)

The question I am having a hard time figuring out is:

for utterance B alveolar pressure Wass generated entirely by muscle forces around

a) 75%

b)55%

c)40%

I am thinking that the answer is 75% but I am unsure.

100 904 60- 70 8 60- Percent of vital capacity 50 40- 30- 20 10- 0 my -10-50-10-30 -20 -10 0 +10+20 +2010+50 +60 cm H70