Two famous examples of the detrimental effects of introducing new species are
(B) is the correct answer. The killer bee was introduced into the Americas by accident when scientists brought African honeybees to Brazil in an attempt to breed a new variety of bee. They killed 10 people in the US by 2000. The zebra mussel was accidentally introduced through unknown means into a lake in Detroit and has caused millions of dollars of damage to water pipelines. It even threatens to outcompete native species.