The correct responses regarding the phrase "the straw that broke the camel's back" are:
- This phrase is an idiom.
- This phrase is a metaphor.
- It means something was the final problem in a dilemma.
The statement "It means the camel was injured" is not correct in the context of the phrase's meaning. The phrase metaphorically illustrates that a small addition or problem can lead to a significant consequence, often after a series of other issues.