question: Q:A 6-year-old girl is brought to the emergency department with difficulty in breathing. Her parents mention that the child has been experiencing an increasing difficulty in breathing over the past few weeks. It is more prominent when she plays outside in the garden. She has similar episodes about twice a week. She has had a slight difficulty in breathing in the past, but it used to subside once she was rested. During the last month, she has also woken up breathless a couple of times at night, the last episode having occurred last night. A pulmonologist suspects an intermittent obstructive lung disease and orders a pulmonary function test. Her forced expiratory volume is assessed before and after the administration of inhaled albuterol. Her readings are plotted in the graph below. Based on the graph below, which of the following percentage changes in her expiratory volumes would indicate a reversible obstructive pulmonary condition?? 
  {'A': '12%', 'B': '9%', 'C': '50%', 'D': '75%', 'E': '85%'},