Chapter 17, Problem 76PP

What is the best explanation for the observation that the electric charge on the stem became positive as the charged bee approached (before it landed)?

1. A.    Because air is a good conductor, the positive charge on the bee's surface flowed through the air from bee to plant.
2. B.     Because the earth is a reservoir of large amounts of charge, positive ions were drawn up the stem from the ground toward the charged bee.
3. C.     The plant became electrically polarized as the charged bee approached.
4. D.    Bees that visited the plant earlier deposited a positive charge on the stem.