单选题 How did environmentalists manage to protect dolphins?

A、 They prevented fishermen from selling them for meat.
B、 They pressured fishermen into protecting dolphins by law.
C、 They brought political pressure against tuna companies.
D、 They created sanctuaries where dolphin fishing was not allowe

【正确答案】 C

【答案解析】[解析] 第二段：环境保护者制造巨大政治经济压力阻止捕捞公司买卖其产品，其中包括海豚。