In a system using event sourcing, what is the trade-off of storing every state change as an immutable event rather than just the current state?

A Event sourcing provides a complete audit trail and the ability to reconstruct past states or replay events, but requires additional complexity for querying current state efficiently (often via snapshots or read models/CQRS) B Event sourcing means the system never needs to store any data at all C Storing events instead of current state guarantees faster reads with zero additional complexity D Event sourcing eliminates the need for any database technology