Choose the word that best completes the sentence.Hint: Determine the connotation (positive or negati

Choose the word that best completes the sentence.Hint: Determine the connotation (positive or negative) through context clues.Although the problem was difficult to resolve, Sandra and John were （）in searching for an answer.Their teacher was quite proud.

A.persistent

B.stubborn

C.bullheaded

D.headstrong

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