Question: When a negatively charged rod is brought near, but does not touch, the initially uncharged electroscope shown above, the leaves spring apart (I). When the electroscope is then touched with a finger, the leaves collapse (II). When next the finger and finally the rod are removed, the leaves spring apart a second time (III). The charge on the leaves is A) positive in both I and III  B) negative in both I and III  C) positive in I, negative in III  D) negative in I, positive in III. Please choose an answer from [A, B, C, D].
Answer: D