When the Atrial Waveforms Appear in a Saw-Toothed Pattern It

When the atrial waveforms appear in a saw-toothed pattern it reflects that the:

A) impulses are arising from different locations in the atria.
B) atria are firing at a rate of between 250 and 350 beats per minute.
C) a delay in the movement of the electrical impulse between the right and left atria.
D) impulse is being blocked as it travels through the bundle of His.