A 3-ohm resistor and a 6-ohm resistor are connected in series across a 9-volt battery.  Which statement best compares the potential difference across each resistor?  A. The potential difference across the 6-ohm resistor is the same as the potential difference across the 3-ohm resistor.    B. The potential difference across the 6-ohm resistor is twice as great as the potential difference across the 3-ohm resistor.    C. The potential difference across the 6-ohm resistor is half as great as the potential difference across the 3-ohm resistor.    D . The potential difference across the 6-ohm resistor is four times as great as the potential difference across the 3-ohm resistor.

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