I said to my brother, "What are you playing today ?"

A I asked my brother what he will be playing that day.

B I asked my brother what he was playing that day.

C I asked my brother if he was playing that day.

D I asked my brother what he would be playing that day.

Correct Answer: Option B

When there is wh-questions inside invertved commas then we do not use if or whether in indirect speech.

Note: wh-questions means, questions starting with, "who", "what","why", "whom" etc.