Observing which phenomenon in a disturbance can be taken as support that the disturbance is a wave?

1. Interference effects are cited as one way to support that something is a wave. 2. This matches option A. 3. Reflection, absorption, and conduction, options B, C, and D, are not the phenomenon singled out as support for wave behavior here. _Source: OpenStax Physics (CC BY 4.0), Ch 14 "Sound", section 14.4 Sound Interference and Resonance_