Correct Answer: He asked me where I had gone to collect the flower samples.

Solution : The correct choice is the fourth option .

Narration Conversion:

• The reporting verb asked is used in the case of an interrogative sentence.
• The past perfect tense (had you gone) changes to the simple past tense (did go) .
• The second-person pronoun you is changed to the first-person pronoun I in the indirect form, as it is the correct pronoun to use to refer to the speaker.

Therefore, the correct sentence is: He asked me where I had gone to collect the flower samples.