Which of the Following Are True Statements Related to the Volume

Multiple Choice

Which of the following are true statements related to the volume of tissue nitrogen excreted during the N₂ washout test for measuring functional residual capacity (FRC) ?
I. It is not a factor.
II. It varies with the length of the test.
III. It varies with the weight of the patient.
IV. It cannot be correct for.

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