Task: Reasoning / Logical Reasoning
User instruction:
A is in the development position.
B is in the design position.
C is a conference attendee.
D is a certificate holder.
All conference attendees are salary negotiation candidates.
Everyone in development and design positions are not conference attendees.
Among the salary negotiation candidates, those in the design position are not promotion candidates.
Among the salary negotiation candidates, those who are both certificate holders and conference attendees are promotion candidates.
All salary negotiation candidates are certificate holders.
Those in development position are not promotion candidates.
If B is not a certificate holder, then B is a conference attendee.
D is in the design position.
Certificate holders who do not attend the conference are not promotion candidates.
Conference attendees who do not hold certificates are not promotion candidates.
B is a salary negotiation candidate.

Then, among A, B, C, and D, who are expecting promotion?

Evaluation criteria:
You must refer to the given passage only for the answer.
The final answer must be one or more of A, B, C, and D, or none of them.
The explanation for the answer must be logical.
The correct answer is C, and that answer must be presented.