The last one because it is giving vivid imagery. There are descriptive adjectives in the sentence as well, that tells the reader what kind or quality of the noun.
Read it thoroughly again and again then answer the questions and then go over the questions again and if you think your answer is incorrect ask that specific question and we can help you with it
Answer:
they are cold blooded
skin is smoothy
breath through skin and sometimes with lungs
Answer: that he not coming back