GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - GLC5RO2HRZ0269A1J

Which of the following can be inferred from the passage about kelp forests in the Bering and Copper is lands between 1750 and 1768? A. They were reduced significantly. B. They disappeared entirely from the region. C. They were the primary food source for sea otters. D. They were harvested in record numbers by humans. E. They increased pressure on sea urchin populations.