请教TPO里一个插空题

nkqljUID: 3192376

记不清楚是哪套了，但应该不影响做题。题目如下
Paragraph 6: Impacts by meteorites represent one mechanism that could cause global catastrophes and seriously influence the evolution of life all over the planet. █According to some estimates, the majority of all extinctions of species may be due to such impacts. █Such a perspective fundamentally changes our view of biological evolution. █The standard criterion for the survival of a species is its success in competing with other species and adapting to slowly changing environments. █Yet an equally important criterion is the ability of a species to survive random global ecological catastrophes due to impacts.

13. Look at the four squares [█] that indicate where the following sentence can be added to the passage.
This is the criterion emphasized by Darwin's theory of evolution by natural selection.
Where would the sentence best fit?
我选的是4.答案是3.分析了好多遍还是绕不过来，求解啊！！！

nkqljUID: 3192376

各位亲亲亲爱的gter们给个解释吧！