I asked my sister the source of $10K deposited into her bank account. Initially she told me it was a lottery winning, later on she told me it was a disposal of her shares, 2 days later she told me, it was a sale of her car, a week later, she told me it was a gift. So in short, she keeps changing her story.
I wanted to use the word "evolve" in this context. And because it is a matter of fact, which of the following sentence is more correct.
A. Her explanation evolves
B. Her explanation is evolving.
Thank you in advance