I'm fairly certain it's the first answer but it may be the third answer as well but I believe it's the first more though.
They eat plants, plants get energy from the sun...
Answer:
A transition that shows the result of an action is a: causal transition.
Explanation:
A causal transition is a word or group of words used when an author or a speaker intends to show a cause-and-effect relationship. That is, this type of transition connects one thing to another in order to represent one as the result of the other. Examples of causal transitions are: due to, hence, in order to, as a result of, since, etc.