Nothing seemed very inspiring ______ then she heard a song called 'Simply the best'.

• A. But
• B. And
• C. Or
• D. So

Answer: (B)

The idea is to connect two events in time with a simple connector that shows a straightforward sequence. Nothing seemed very inspiring, and then she heard a song called 'Simply the best.' The word and works here because it links the first clause to the next as a smooth addition, and the presence of then already signals a sequence. So the sentence reads as a progression: nothing seemed inspiring, and then something happened—she heard a song.

Using but would shift the nuance to contrast, implying the second event counters the first. Or would present an option, which doesn’t fit the flow. So would suggest a consequence that doesn’t really make sense here.