A student rubs a balloon made of rubber on his hair and notices that the balloon sticks to his hair afterwards. What happened to the electrical charges of both the student's hair and the balloon? (1 point)
A. The balloon's charge became positive, and the hair's charge became positive
B. The balloon's charge became negative, and the hair's charge became negative
C. The balloon's charge became neutral, and the hair's charge became positive
D. The balloon's charge became negative, and the hair's charge became positive