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Discussion :: Essential part

  1. lightning

    2. A.
    electricity
    B.
    thunder
    C.
    brightness
    D.
    rain

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    Answer : Option A

    Explanation :

    Lightning is produced from a discharge of electricity, so electricity is essential. Thunder and rain are not essential to the production of lightning (choices b and d). Brightness may be a byproduct of lightning, but it is not essential (choice c).

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