Institution: জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় (JKKNIU) Exam: ক ইউনিট || জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় || 2013
Topic: Narration or Speech, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The original statement, "I said, 'Do it,'" indicates a directive or command issued by the speaker. In this context, changing the narration requires us to convey the same intent and tone behind the original speech.

Among the provided options, **D) I ordered someone to do it** accurately captures the authoritative nature of the statement. The phrase "ordered" implies a command that carries an expectation of compliance, aligning perfectly with the original intention of "Do it," which is an imperative phrase directing someone to perform a specific action.

On the other hand, the other options do not convey the same level of urgency or command:
- **A) I said that it should be done** softens the directive by implying a suggestion rather than a command.
- **B) I said that let it be done** introduces an indirectness that deviates from the assertiveness of the source.
- **C) I said to do it** is somewhat close, but it lacks the imperative weight and authority of the term "ordered."

Thus, D is the correct transformation as it preserves both the meaning and the tone of the original statement, effectively conveying the speaker’s intent to command action.