Why Is Adenosine (Adenocard)given to a Patient Rapidly by Intravenous

Why is adenosine (Adenocard) given to a patient rapidly by intravenous (IV) push?

A) If given slowly,the heart rate will dramatically increase.
B) When given slowly,the drug is eliminated before it can act on the heart.
C) Slow administration can lead to tissue irritation and IV infiltration.
D) The drug is given rapidly so that within a minute,second or third doses may be given if needed.