A.Protect roads along the shore.
B.Build on beaches with seawalls.
C.Add sand to beaches with seawalls.
D.Stop building seawalls.
参考答案D
解析:What would the speaker probably advise engineers to do?
细节题。根据Because of the real risk of losing beaches,many geologists support a ban on all types of stabilizing construction on the shorelines.可知发言者可能建议工程师停止建造海堤。因此,正确答案为D。