I said to her, "Don't walk so fast."

In the following question , a sentence has been given in Direct/Indirect speech. Out of the four alternatives suggest-ed, select the one which best expresses the same sentence in Indirect /Direct speech. Ram said to Rohan , "Don't run so fast" .

Change the given sentence into indirect speech. I said to him, "I don't know what Shobhana is doing."