Answer: D. Mitigation
Explanation: What pops out to me in this question is "decreasing the loss of life and devastation from a tsunami." I thought it was A for a second but I remembered the definition of Mitigation. Mitigation means the action of reducing the severity, seriousness, or painfulness of something. This means that this was here to decrease the loss of people. If this answer so happens to be incorrect, A should be the correct answer. But here they are trying to reduce losing people therefore, D would be the correct answer.