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    Question

    Select the option that expresses the given sentence in

    passive voice. The scientist conducted the experiments in a controlled environment, while closely monitoring the variables.
    A The experiments were conducted by the scientist in a controlled environment, while closely monitoring the variables. Correct Answer Incorrect Answer
    B The experiments were conducted in a controlled environment by the scientist, while closely monitoring the variables. Correct Answer Incorrect Answer
    C The experiments were conducted in a controlled environment, while closely monitoring the variables by the scientist. Correct Answer Incorrect Answer
    D The experiments were conducted in a controlled environment, while the variables were closely monitored by the scientist. Correct Answer Incorrect Answer

    Solution

    In the active sentence, "The scientist" is the subject, and "conducted the experiments" is the verb. To convert it into passive voice, we make the object "the experiments" the subject, and the subject "the scientist" becomes the agent of the action (by whom the action is performed). "In a controlled environment" and "while closely monitoring the variables" remain unchanged.

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