In the following question, a sentence has been given in Direct/Indirect speech. Out of the four alternatives suggested, select the one which best expresses the same sentence in Indirect/Direct speech. My mother said to my father, "I am very busy now."

• My mother told my father that I am very busy now.
• My mother told my father that she is very busy then.
• My mother told my father that she was very busy then.
• My mother told my father that I was very busy now.