Select the correct indirect form of the given sentence.

Shanti asked me, "Why did you keep this smartphone in the bin?"

A

Shanti asked me why I had kept that smartphone in the bin.

B

Shanti asked me why I was keeping that smartphone in the bin.

C

Shanti asked me why I had been keeping that smartphone in the bin.

D

Shanti asked me why I kept that smartphone in the bin.