Hey Anjali!
It seems like you haven't mentioned in what reference you are asking this question. I assume you are asking any textbook question of English subject. If in case you are referring to any textbooks question of any chapter then you will have to mention the name because without the complete information no proper answer could be provided. You may write the reference in the comment section or you may post your question with mentioning the reference so that your query can be answered adequately.
Question : Select the most appropriate indirect form of the given sentence.
He said to his brother, "Where did you go for a picnic?"
Option 1: He asked his brother where he had gone for a picnic.
Option 2: He asked his brother where did you go for a picnic.
Option 3: He asked his brother where did he go for a picnic.
Option 4: He asked his brother where he went for a picnic.
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