Which of the Following Statements Are True of Ejection Fraction

Multiple Choice

Which of the following statements are true of ejection fraction?
I.It is a measure of ventricular contractility.
II.The heart's normal ejection fraction is approximately 60% of the end-diastolic volume under resting conditions.
III.The heart's normal ejection fraction is approximately 90% of the end-diastolic volume in strenuous exercise.
IV.The heart's normal ejection fraction is approximately 80% of the end-diastolic volume under resting conditions.

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