Which of the Following Are Limitations to Spirometry Testing

Multiple Choice

Which of the following are limitations to spirometry testing?
I.Spirometry is an effort-dependent test that requires careful instruction and the cooperation of the test subject.
II.Inability to perform acceptable maneuvers may be due to poor subject motivation or failure to understand instructions.
III.Physical impairment and young age (e.g.,<5 years of age) may also limit the subject's ability to perform spirometric maneuvers.

A) I and III
B) II and III
C) I, II, and III
D) I and II