Which of the Following Is True of the Contraction of the Heart

Multiple Choice

Which of the following is true of the contraction of the heart

A) The ventricles contract first, followed by the atria.
B) The contractions do not occur in any specific repeatable sequence each time.
C) Cardiac contractions are coordinated by specialized conductive cardiac muscle fibers.
D) The muscle obtains the beat from the pacemaker region exclusively.
E) None of the answers are correct.