Final answer:
Perfect consecutive interference for waves occurs when two identical waves that are in phase superimpose, resulting in pure constructive interference. If they are exactly out of phase, pure destructive interference occurs, cancelling the waves out.
Step-by-step explanation:
Pure constructive interference occurs when two identical waves arrive at the same point exactly in phase, meaning the crests and troughs of both waves are precisely aligned. This results in a wave with twice the amplitude of the individual waves, but the same wavelength. However, pure destructive interference happens when two identical waves arrive at the same point exactly out of phase - crests align with troughs of the other wave - leading to the waves completely cancelling each other out, resulting in zero amplitude.
Answering the multiple-choice question, option d is correct. A scenario of pure destructive interference occurs when two waves with equal frequencies that are perfectly out of phase and propagating along the same line superimpose on each other.