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Read the passage carefully and answer the questions given below: Henderson Island in the South Pacific Ocean has always been known for its remarkable bio-logical diversity and untouched ecology. Now the remote UNESCO World Heritage site that lies 3,100 miles (5,000 km) from the closest human settlement can also lay claim to being one of the most polluted places on Earth. Jennifer Lavers a researcher from the University of Tasmania's Institute for Marine and Ant-arctic Studies who has been studying the coral atoll for a few years says the tiny 14.4 square miles (37.3 square kilometers). Island is home to over 38 million pieces of waste. According to the scientist this is the "highest density of anthropogenic waste recorded anywhere in the world with 99.8 per cent of the pollution plastic." The amount of trash is surprising given that the island the largest of the group of four Pitcairn volcanic islands has no residents and is visited by scientists only once or twice every decade. However as it turns out humans do not need to be physically present to pollute an area. In this case the trash is brought in by the South Pacific Gyre an ocean current that sends garbage bobbing through the sea to Henderson. The primary offenders are fishing-related debris like lines and nets and single-use household items. What's even worse is that the unsightly rubbish scattered across the island's sandy beaches is just the tip of the iceberg. According to the re- searchers over 68% of the junk is buried under the sand. This means their estimates based on the trash found up to 10 centimeters below the sand may be underestimating the full extent of me pollution. Besides being aesthetically unpleasing the waste is also harmful to the island's wildlife. Lavers and study co-author Alexander Bond discovered hermit crabs taking refuge in toxic cosmetic jars and sea trutles which come to the island to lay eggs get entangled inside fishing lines. The trash is also harmful to seabirds and fish that mistake the colorful plastic pieces for food.

The underlined phrase, "just the tip of the iceberg" in Paragraph 3 in the passage means:

A) There is more junk under the sand that meets the human eye

B) The pollutants are fishing-related debris, like—lines and nets, and single-use household items      

C) The sandy beaches have a lot more of biological diversity and untouched ecology today

D) All of the above