Seahorse populations have declined everywhere that seahorse are fished. During the past five years, seahorse populations have decreased by 50 percent. Last year, biologists met to discuss what might be done to reverse this trend.
Which statement must be true according to the given information?
I. Seahorses are likely to become extinct within five years.
II. One way to increase seahorse populations is to ban the fishing of seahorses.
III. Biologists from all over the world are working to save the seahorses.
IV. Seahorse fishermen have spoken out against the biologists.

Question: 以下哪项是正确的？
Options:
A. IV 或 I, B. II 或 III, C. 仅 IV, D. 仅 III, E. III 或 I
Answer: B
True statement: II