A Pre- and Postbronchodilator,partial Expiratory Pressure-Volume Maneuver Was Performed on a 9-Month-Old

A pre- and postbronchodilator,partial expiratory pressure-volume maneuver was performed on a 9-month-old boy.The child's prebronchodilator mₐₓFRC was 67 mL/second and the postbronchodilator mₐₓFRC was 94 mL/second.How should the therapist interpret these data?

A) The data are erroneous.
B) The data are inconclusive.
C) The patient will not clinically improve with bronchodilator administration.
D) The patient has demonstrated clinically significant improvement with bronchodilator administration.