The correct option is
A They ran like the wind.
A simile is a figure of speech that compares two things to one another. It will always have 'as' or 'like'.
Option A: This sentence compares two things together 'they' ran 'like' in the same manner as 'the wind'. The word 'like' displays this comparison. Hence, this is a simile and option A is correct.
Option B: This sentence does not compare, but directly states that one 'she' is another 'bird'. This is called a metaphor, and not a simile.
Option C: This indicates an action and does not show comparison.
Option D: This sentence, too, states and action and not a comparison.
Hence, options B, C and D are wrong.