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      Question

      In the 1990s astronomers carried through exhaustive

      lensing experiments involving the study of millions of stars in the galactic central areas and in the Magellanic Clouds to search for dark objects whose masses would cause lensed brightenings of background stars. i.            In the 1990s astronomers carried off ii.            In the 1990s astronomers carried in iii.            In the 1990s astronomers carried out
      A Only iii Correct Answer Incorrect Answer
      B Both i and ii Correct Answer Incorrect Answer
      C Both ii and iii Correct Answer Incorrect Answer
      D Only i Correct Answer Incorrect Answer
      E No improvement required Correct Answer Incorrect Answer

      Solution

      The phrasal verb ‘carried out’ means ‘to act’ or ‘to do any task or work’. Hence it is correct and fit according to the context of the sentence.

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