Select the correct indirect form of the given sentence.

My younger sister said, "I bought a new carrom board yesterday".

My younger sister said that she had bought a new carrom board the day before.

The correct indirect form of the given sentence is:

My younger sister said that she had bought a new carrom board the day before.

The other options are incorrect for the following reasons:

• My younger sister said that she has bought a new carrom board the day before. The modal verb "has" should be in the past tense, "had".
• My younger sister said that she has bought a new carrom board the day before yesterday. The time reference "the day before yesterday" is incorrect, since the statement is being reported from the perspective of the day after the carrom board was bought.
• My younger sister said that she had bought a new carrom board the day before yesterday. This is the same as the third option, but it is repeated.