题目内容：
根据材料，回答题：
A. Natural sponges become cleaning aids.
B. We pollute the ocean when we use it as a garbage dump.
C. The area of the sea is becoming smaller and smaller.
D. Along with salt, other minerals are left after evaporation.
E. We even use their bones for fertilizer.
F. Some of its contents may cause illness.
请在（46）处选择最佳答案。
参考答案：
答案解析：