Answer:
Option C, rising sea levels
Step-by-step explanation:
It is concluded by the geologist that the ice depositions at the poles will melt due to the increasing temperature at global level. The melted ice that is now in the form of water will eventually flow to sink into the ocean/seas thereby increasing the level of sea/ocean. The increased level of sea will further drain the coastal areas near by it and thus will adversely affect not only the flora and fauna but also the human settlements nearby.
Thus, option C is the correct answer