How do destructive waves typically affect beaches?

Destructive waves are characterized by their strong energy and power, which play a significant role in the erosion of coastlines. They typically have a steep formation, and when they break, they generate a powerful backwash that effectively pulls sand and other materials from the beach back into the ocean. This process leads to the removal and erosion of sand from the beach, making it the correct answer.

In contrast, the other options describe processes associated with constructive waves or coastal stability rather than the effects of destructive waves. Constructive waves are known for building up beach material and aiding in sediment deposition, while maintaining beach morphology is more related to balanced wave actions. Hence, understanding the destructive nature of these waves is crucial for comprehending coastal dynamics and the ongoing changes that beaches undergo due to wave action.