Which Statement Accurately Explains How Calcium Channel Blocker Verapamil Assists

Which statement accurately explains how calcium channel blocker verapamil assists to correct an arrhythmia?

A) The medication desensitizes the heart to the impulse to contract.
B) The medication increases the strength of the impulse from the atrioventricular (AV) node.
C) The medication alters the impulse from the sinoatrial (SA) node.
D) The medication inhibits transmission of the impulse from the AV node.