阅读理解：There are some familiar animals 

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There are some familiar animals like cnidarians（刺细胞动物），but these also raise quite a lot of questions. Cnidarians exist widely in modem oceans and have simplistic bodies that suggest they evolved early during the rise of animal life. Given this, it was expected that cnidarians would be common in the sedimentary layers when the Burgess Shale and Chengjiang sites were first unearthed. But precisely the opposite proved true.

Qingjiang surprised Dr Zhang by being loaded with spectacularly well-preserved members of this soft-bodied group. Containing everything from delicate comb jellies to the medusae（水 母）,Qingjiang reveals that these animals were well established at the time and rapidly multiplying in some environments. Precisely what these environmental differences were though, remains the subject of considerable inquiry. Anyway, the discovery of the fossils could make clear the diversity of extinct creatures as well as their connection with animals in modem times, said Zhao Fangchen, a researcher of Chinese Academy of Sciences.

What is the most probable reason of those soft-bodied animals' being so well-preserved?

Existing widely in some environments.

Being buried alive by a sudden mud.

Being abandoned during evolution.

Being well-established at the time.