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    Question

    Because of the ___________ interstellar dust and the

    interior location of the solar system, the spiral structure is very difficult to detect optically.
    A Obscuring Correct Answer Incorrect Answer
    B Observant Correct Answer Incorrect Answer
    C Obsolete Correct Answer Incorrect Answer
    D Obsolescent Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    Obscuring means something that is hidden or not known. This word makes the sentence meaningful as it relates to the later part within the sentence –‘very difficult to detect optically’.

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