Final answer:
The correct answer is C) 'If the balloon acquires charge, Sam's hair loses charge.' This adheres to the law of conservation of charge which states that charge is neither created nor destroyed, but transferred, resulting in a negatively charged balloon and positively charged hair after rubbing the two together.
Step-by-step explanation:
The law of conservation of charge states that electric charge is neither created nor destroyed. When Sam rubbed the balloon against his hair, some electrons were transferred from his hair to the balloon due to friction. This meant that the balloon gained excess electrons and became negatively charged, while Sam's hair lost electrons and became positively charged to a corresponding degree. As a result, the balloon was attracted to the neutrally charged wall due to induced polarization.
Option C) “If the balloon acquires charge, Sam's hair loses charge.” is the correct answer. This accounts for the law of conservation of charge during the process. Sam's hair and the balloon were both electrically neutral before charging. After charging, the balloon had a net negative charge, while Sam's hair had an equivalent net positive charge, keeping the overall charge conserved.