Answer:
The answer is: B
Step-by-step explanation:
The most extraordinary fact about the monarch butterflies is that they fly around 4,500 kilometers to arrive to Mexico. Letter a is not possible for although it is a pollination agent, as other insects, that isn't extraordinary of them. Letter C isn't possible because they actually can live 9 months, not 8, and yes, that is 12 times more than other butterflies, but that fact isn't true entirely, so that's why it cannot be that option. And well, letter D says "extraordinary for all of the above", so this one is definitely not possible.