The best answer is the final one.
In "No Exit," Estelle needs a mirror because she doubts she exists unless she can see herself. This behavior is another example of what Sartre says is "bad faith." This is an example of bad faith because Estelle, having no faith in herself, needs something external (i.e., a mirror) to define herself, instead of looking inward.
By making the way characters speak sound authentic
hope this helps :)
C: personification,because they are saying as if the bird has hands in which it does not so they are giving it a human quality.