Two vertical metallic plates carrying equal and opposite charges are kept parallel to each other like a parallel plate capacitor. A small spherical metallic ball is suspended by a long insulated thread such that it hangs freely in the center of the two metallic plates. The ball, which is uncharged, is taken slowly towards the positively charged plate and is made to touch and plate. Then the ball will

• A. stick to the positively charged plate  
• B. come back to its original position and will remain there   
• C. oscillate between the two plates touching each plate in turn  
• D. oscillate between the two plates without touch them