All the samples were found to contain compounds that derive from polystyrene (聚苯乙烯) - a common plastic used in disposable cutlery, Styrofoam (聚苯乙烯泡沫塑料), and DVD cases, among other things. These toxic compounds don't occur naturally in the ocean, and the researchers thought plastic was the culprit.The lead researcher of the team said that plastic should be considered a new source of chemical pollution in the ocean. The team later simulated the decomposition of polystyrene in the sea and found that it degraded at temperatures of 86 Fahrenheit (30 degrees Celsius). Left behind in the water were the same compounds detected in the ocean samples, such as bisphenol A (BPA) and styrene trimer. BPA, a chemical used in hard plastics such as reusable water bottles, has been shown to interfere with the reproductive systems of animals, while styrene trimer is a substance suspected of causing cancer.What does the Japanese research team's simulation study suggest?

The Japan-based team collected samples in waters from the U.S., Europe, India, Japan, and elsewhere. All the samples were found to contain compounds that derive from polystyrene (聚苯乙烯) - a common plastic used in disposable cutlery, Styrofoam (聚苯乙烯泡沫塑料), and DVD cases, among other things. These toxic compounds don't occur naturally in the ocean, and the researchers thought plastic was the culprit. The lead researcher of the team said that plastic should be considered a new source of chemical pollution in the ocean. The team later simulated the decomposition of polystyrene in the sea and found that it degraded at temperatures of 86 Fahrenheit (30 degrees Celsius). Left behind in the water were the same compounds detected in the ocean samples, such as bisphenol A (BPA) and styrene trimer. BPA, a chemical used in hard plastics such as reusable water bottles, has been shown to interfere with the reproductive systems of animals, while styrene trimer is a substance suspected of causing cancer. What does the Japanese research team's simulation study suggest? A. Polystyrene is indeed the source of pollutants found in ocean waters. B. It is very difficult for most plastics to break down in cool temperatures. C. The compounds in polystyrene are different from those found in the ocean. D. There are some other sources of chemical pollution in the ocean besides plastic.