When “let me” appears in direct speech, in indirect speech it’s common to use reporting verbs like asked, requested, or offered.
The structure becomes: reporting-verb + me/her + to + infinitive (do, do her work, etc.).
Commands and requests (which “Let me do my work” is more like a request) are reported with verbs like ask / request / tell / order. The choice depends on tone: “order” is stronger, “request”/“ask” is more polite.
Pronoun changes are needed: “me” becomes “her.” Also, the direct infinitive “do my work” becomes “to do her work.”
✅ Applying That to This MCQ
Putting those rules together:
“Diana said to me, ‘Let me do my work.’”
In indirect speech, since it’s a request using “let me,” we use a reporting verb like requested or asked.
Adjust pronouns: “me” becomes “her.”
The infinitive structure “to do her work” matches the rules.
Thus the correct narration is:
“Diana requested me to let her do her work.”