Verified Answer :

taskmasters

I believe preamble was created to be able to give the people a correct justice and welfare.
Thus, this words are used as personification.
Why?
because this was referred to a person. 
A person needs right welfare and justice that's why they pushed this preamble to be able to give the people what they deserve to have. And to be able to have an equal society for prosperous country.

The correct answer is actually B Diction

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