The poetic device used is Alliteration. Thus the correct option is (B).
What is Alliteration?
Alliteration is the literary device which refers to the repetition of the consonants of the first letter of the word. It is occurrence of the same letter. The words must be close to each other. For example:- "Leaping lizards" in is this example the first letter L is repeating i.e. l for leaping and L for lizard.
In the above Phrase, "stand stock - still" there is the occurrence of the consonant letter "S" that too with proximity to each other. Thus the literary device used here is alliteration.
Thus the correct option is (B).
Learn more about the literary devices here;
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