A Fine Crystal Wineglass (Actually Made from Lead-Based Glass) Emits

A fine crystal wineglass (actually made from lead-based glass) emits a long, pure tone when you flick it with your finger, while a cheap ordinary wineglass emits a "thunk" sound instead. Although you can break either wineglass with sound by choosing the right tone and making it sufficiently loud, it is easier to break the crystal wineglass because the crystal wineglass

A) is made from a weaker material and fractures more easily.
B) vibrates in response to a broader range of pitches.
C) wastes less energy as it vibrates and thus stores energy better.
D) cannot bend at all without breaking.