In the case of Interrogative sentences like this, "enquired (of)", "wanted to know", "asked", etc in Indirect Speech is changed into "said" in Direct Speech.
In Direct speech, the verb is always placed before the subject, unlike in Indirect Speech.
For example:
The teacher asked him what his name was. (Indirect Speech)
The teacher said to him, "What is your name?" (Direct Speech)
The tense of the Indirect Speech is in the past continuous. So, the tense in the Direct Speech will be in the present continuous.
The following things in the sentence will change when changed from Indirect Speech to Direct Speech:
· 'was doing' changes to 'are doing'.
· 'I' changes to 'you'.
· 'my' changes to 'your'.
Therefore, the correct answer is: Hira said to me, "How are you doing being all alone in your house?"