Please solve it

Please solve it 19. O Zn/HO 3-0xobutanal only Compound 'X' is : (A) I-Methylcyclopropene (C) 1 , 4-Dimethylcyclohexa-l ,3-diene Four monochloro structural isomeric products 4-Dimethylcyclohexa-l ,4-diene 2-Dimethylcyclohexa-1 ,4-diene