Answer:
The answer is D.
Step-by-step explanation:
Correct on Edmitnum and Plato.
Why? While an arpeggio is technically a broken chord (so B seems like it makes sense), the word discontinuous, in this case, is your hint. Discontinuous (not dissonance, my music lovers, two different things :) as in the notes are one after another rather than played simultaneously.
All it is is a fancy (and kinda confusing) way for the test to say that an arpeggio is a broken chord.