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In a classroom experiment, A student rubs a comb against her hair. The comb is then brought near bits of paper resting on a surface. Which of these can be concluded if the comb picks up the bits of paper?

A) The comb is an insulator, but paper conducts electricity.

B) The comb had a net charge on it, and it attracted a neutral object.

C) The comb was left uncharged, and it attracted a positively charged object.

D) The comb was positively charged, in attracted a negatively charged object