Answer:
A.) The spheres develop opposite charges.
D.) Electrons move from sphere A to sphere B.
E.) The spheres are charged through conduction.
Step-by-step explanation:
In the diagram, spheres A and B are in contact, so this method is charging by contact or conduction. The rod is negatively charged, thus it attracts the protons in A and repels it electrons. Which flow into sphere B when earthened, so that B becomes negatively charged. On separation of the spheres and then removal of the charged rod, sphere A would be positively charged. Thus spheres A and B possess opposite charges.