Question

hich of these events is an example of resonance?
A. A bridge collapses due to the overloading of vehicles using it.
B. A baker kneads dough by pounding it repeatedly.
C. The sound of two guitars changes from loud to soft every second.
D. An ambulance siren rises and falls in frequency as it passes you by.
E. An opera singer breaks a thin glass with only the use of her high frequency voice.