3.Three lab groups are exploring methods of charging. Group 1 is charging a plastic comb by vigorously combing a lab member’s hair with it.
Group 2 is charging an insulated metal sphere by bringing a negatively charged metal rod into contact with the sphere, and then breaking contact between the sphere and the rod.
Group 3 is charging an insulated metal sphere by bringing a negatively charged metal rod with a wooden handle near the metal sphere (but not touching), grounding the sphere, and then removing the rod from the lab space.

Which of the following correctly identifies the method of charging for these three groups?

A. Group 1 by induction, Group 2 by friction, Group 3 by conduction
B. Group 1 by conduction, Group 2 by induction, Group 3 by friction
C. Group 1 by friction, Group 2 by induction, Group 3 by conduction
D. Group 1 by friction, Group 2 by conduction, Group 3 by induction