The school nurse is performing pediculosis capitis (head lice) assessments. Which assessment finding indicates that a child has a "positive" head check for lice?

A. Maculopapular lesions behind the ears: Maculopapular lesions are not characteristic of head lice infestation. B. White sacs attached to the hair shafts in the occipital area: White sacs (nits) attached to hair shafts are characteristic of head lice infestation. C. White flaky particles throughout the entire scalp region: White flaky particles are more suggestive of dry scalp or dandruff, not head lice. D. Lesions in the scalp that extend to the hairline or neck: Lesions extending to the hairline or neck could indicate secondary infection but are not specific to head lice infestation.