Ronan rubs a rubber balloon on his hair. He observes that the balloon then sticks to his hair. How did the charges on the balloon and on his hair change?

A. The charge on the balloon became positive. The charge on his hair became negative.

B. The charge on the balloon became negative. The charge on his hair became positive.

C. The charge on the balloon became negative. The charge on his hair became negative.

D. The charge on the balloon became positive. The charge on his hair became positive.