A company has three factories A. B, and C. For a new product appraisal, the company made the following provisions: (1) If factory B does not participate in the appraisal, then factory A cannot participate, (2) if factory B participates in the appraisal, Then both Factory A and Factory C also participated. Excuse me, which of the following four sentences is wrong? ['When factory A. participates, factory B also participates.', 'When plant B. B participates, plant C also participates.', 'When factory C. C participates, factory A may not participate.', 'When plant D. A participates, plant C may not necessarily participate.']