You have a long board balanced on a rock. When you place a heavy object on one side, the board tilts down. Consider the following changes, Which of these changes would most effectively bring the board back to balance?

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• A Place the heavy object higher above the board.
• B Push the board down on the tilted side to balance it.
• C Move the heavy object to the centre of the board.
• D Place a heavier object in the centre of the board.

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