TOEFL Reading: ETS-TOEFL阅读机经 - RY766R51WS37J1FLL$

According to paragraph 1, aquatic amphibians laid their eggs on land in order to A. enable young amphibians to benefit from a dry atmosphere B. ensure the rapid development of a hard shell C. enable young amphibians to evolve features necessary for living on land D. protect young amphibians from the dangers associated with life in the water