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     EduGorilla 
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    Chlorofluorocarbons (CFCs), chemicals found mainly in
    spray aerosols heavily used by industrialized nations
    for much of the past 50 years, are the primary culprits
    in ozone layer breakdown. When CFCs reach the upper
    atmosphere, they are exposed to ultraviolet rays,
    which cause them to break down into substances that
    include chlorine. The chlorine reacts with the oxygen
    atoms in ozone and rips apart the ozone molecule. One
    atom of chlorine can destroy more than a hundred
    thousand ozone molecules, according to the U.S.
    Environmental Protection Agency. About 90 percent of
    CFCs currently in the atmosphere were emitted by
    industrialized countries in the Northern Hemisphere,
    including the United States and Europe. These
    countries banned CFCs by 1996, and the amount of
    chlorine in the atmosphere is falling now. But scientists
    estimate it will take another 50 years for chlorine
    levels to return to their natural levels.

    The author says that CFCs are primary culprits
    in ozone layer breakdown. Which of the
    following is not a valid reason for this?

    Options :-

    1. They are released by the industrialised nations.

    2. They release chlorine which reacts with the oxygen atoms in ozone.

    3. They can destroy thousands of ozone molecules.

    4. The chlorine released by them can stay in the atmosphere for long duration.

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