Готовы ли вы к GMAT? Третья версия теста

Question 2. Critical Reasoning

Opponents of underwater nuclear testing off the coast of North Korea argue that, while admittedly safer than atmospheric tests, even nuclear tests within the Pacific Ocean can disperse large amounts of radioactive particles in water and steam, potentially causing untold harm to marine life in the region. But this argument is false because when U.S. underwater nuclear testing was common in the southern Pacific Ocean in the 1950s through the 1970s, there was no evidence that the area’s marine life was harmed. Which of the following, if true, most strengthens the argument?