The idea expressed by the chairman of the party is make-believe

A. the idea of good
B. the idea is impressive
C. the idea is well conceived
D. the idea is a form pretence

D. the idea is a form pretence

The chairman of the party expresses a make-believe idea. This suggests that the idea is not genuine or real. It can be considered as a form of pretence or being deceptive. Therefore, the correct answer is D. the idea is a form of pretence.