ANSWER:
D. The rubbed balloon gets a greater charge
Explanation:
If we rub the two bodies against each other, we increase the contact between them, and then the passage of electrons from one body to another is greater, that is to say, in the case of rubbing some of the electrons are released, and remain attached to the balloon. Whereas when it is only touched this does not happen.
So the correct answer is D. The rubbed balloon gets a greater charge