When a spring is stretched by $2\,\, cm$ , it stores $100\,\, J$ of energy. If it is stretched further by $2\,\, cm$ , the stored energy will be increased by ............. $\mathrm{J}$

  • A

    $100$

  • B

    $200$

  • C

    $300$

  • D

    $400$

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