When water freezes due to cold in winter, fishes and other aquatic organisms can survive because only the upper layer of water freezes. This phenomenon occurs because ice is less dense than liquid water, causing it to float on the surface. The layer of ice acts as an insulating barrier, maintaining a relatively stable and warmer temperature in the water below, typically around 4°C. This insulated environment allows fish and other aquatic organisms to survive the winter. Additionally, many aquatic species have adapted to cold conditions, slowing their metabolism and becoming less active to conserve energy. This adaptation helps them survive in the lower, unfrozen layers of the lake. Therefore, the correct answer is [A] survive, because only the upper layer of water freezes.