Correct Answer: Shravan said, "The prisoner had slept throughout the journey."

Solution : The correct choice is the fourth option.

In direct speech, the reported words are directly quoted without any changes to the tense, pronouns , or other elements used in the reported speech.

The steps of conversion are as follows:

• There would be no change in the reporting verb since it has no object.
• There would be no change in the tense of the reported clause because it is in the past perfect tense.
• The words of the speaker are enclosed in the inverted commas.

Therefore, the direct speech sentence would be: Shravan said, "The prisoner had slept throughout the journey."