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?

AThe comb is an insulator, but paper conducts electricity.

BThe comb had a net charge on it, and it attracted a neutral object.

CThe comb was left uncharged, and it attracted a positively charged object.

DThe comb was positively charged, in attracted a negatively charged object