What Does the Orifice Equation Use to Calculate Minimal Cross-Sectional

What does the orifice equation use to calculate minimal cross-sectional area of the velopharyngeal port?

A) Simultaneous measures of the differential pressure across the orifice and rate of airflow
B) The correction factor h
C) Differential pressure across the orifice divided by the rate of airflow
D) The increase in airflow and increase in air pressure across the orifice
E) The pressure drop across the orifice and increase in oral airflow

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