Concept:Moving matter can exhibit a wavelength. This is the idea of wave-particle duality.Explanation:For a body of mass M moving with velocity V, the associated wavelength is given by the de Broglie equation:λ=MVhHere, h is Planck's constant.This shows that matter can behave like a wave as well as a particle.Therefore, the phenomenon is described as the wave-particle paradox or wave-particle duality.Answer:D. wave-particles paradox