在一个应用中备考 SAT、ACT 和 PSAT。

The jellyfish’s ability to produce a violet pulse when threatened ______ a significant evolutionary adaptation.

哪一选项能补全这段文字，使其符合标准英语规范？

1. Arepresents
2. Brepresents,
3. Crepresents:
4. Drepresents;