4. Greta passed a comb through her hair several times. She then placed the comb next to a stream of water flowing from a faucet. Greta observed the stream of water bend toward the comb.

How did passing a comb through her hair allow the comb to bend the stream of water?
A) by making the comb more absorbent
B) by giving the comb an electrical charge
C) by increasing the thermal energy of the comb
D) by breaking some of the chemical bonds in the comb