Context: Amphibians have moist skin and begin their lives in water.
Amphibians are cold-blooded. The body temperature of cold-blooded animals depends on their environment.
A European green toad is an example of an amphibian.
Select the amphibian below.
A. white stork
B. Galapagos giant tortoise
C. Nile crocodile
D. red-eyed tree frog
Answer with the option's letter from the given choices directly.

D