It is important to ask:

Question

Personal health information of employees
Whether a particular problem has been solved before
Whether anyone else in the company has had a similar problem
Both B and C

Answer 1

It seems like you're considering important questions to ask, possibly in the context of HR or problem-solving within an organization.

1. Personal health information of employees: This is sensitive information that should be handled with care and typically only collected when necessary for compliance with laws or policies, such as ensuring workplace safety or providing accommodations. It's important to prioritize privacy and confidentiality.

2. Whether a particular problem has been solved before: It’s beneficial to ask this question as it can help avoid reinventing the wheel and allow for the use of established solutions or best practices.

3. Whether anyone else in the company has had a similar problem: This can provide insights into potential solutions and highlight that the issue might be more common, thus normalizing it and facilitating discussion.

Given these options, both B and C would be the most helpful and relevant to problem-solving within the company context. They focus on collective knowledge and experience, which can lead to more effective solutions.