What has been identified as a significant privacy concern with chatbots?

A significant privacy concern with chatbots is related to the data they handle and how it is processed:

Option A: While code audits are important, this is not the most significant privacy concern for users.

Option B: Chatbots typically do not have robust identity verification mechanisms, but this is not the primary privacy issue.

Option C: Encryption in transit is crucial, but many modern chatbots do encrypt data during transmission.

Option D: Chatbot technology providers may be able to read chatbot conversations with users.

This is the most significant privacy concern because it involves the potential access and misuse of personal data by the service providers. The conversations can include sensitive information that users may not expect to be accessible to third parties.