What changes can occur in an aquatic ecosystem as a result of neutrient loading?

The changes will occur in an aquatic ecosystem as a result of nutrient loading are: changes in natural flow regimes as a result of water extraction and supply direct modification or destruction of important habitats barriers to the movement of plants and animals. For example within rivers and between rivers and their floodplain effects of poor water quality competition from introduced, exotic animal and plant species. 

The correct answer is c.