Question

which action can humans take to reduce wave erosion? build drainage systems build houses near coastlines build breakwaters in the ocean reduce vegetation along coastlines

Explanation:

Breakwaters are structures built in the ocean to absorb the energy of waves, reducing their impact on the shore and thus minimizing wave - erosion. Drainage systems are for managing water runoff, building houses near coastlines can be affected by erosion rather than reducing it, and reducing vegetation weakens the natural protection against erosion.

Answer:

build breakwaters in the ocean