In which sentence below are the brackets used correctly? The magazine quoted him as saying, "Your [sic] not ready for the truth." Experts in the field state that the results are [not] necessarily accurate. I am really [really, really, really] happy that my dad was able to come for graduation. Furthermore, [I believe] the research to be accurate.

D). Furthermore, [I believe] the research to be accurate.

Explanation:

Brackets are characterized as the punctuation marks that are used in a sentence to provide additional or supplementary information to the readers for providing better clarity and understanding of the situation that is being described. Among the given options, the last option correctly employs the square brackets as it encloses words ('I believe') in the brackets that were not originally added by the author and provided with the aim of offering clarity to the situation. The first sentence is incorrect as 'sic' is written using round brackets while the other two are incorrect as they enclose essential words in the bracket.

a and b are the correct answer to what your looking fior