In a certain code, ‘il be peeʼ means ‘roses are blueʼ , ‘sik heeʼ means ‘red flowersʼ and ‘pee mit heeʼ means ‘flowers are vegetablesʼ, then which word stands for ‘redʼ?

We are given that  ‘il be peeʼ means ‘roses are blueʼ, ‘sik heeʼ means ‘red flowersʼ and ‘pee mit heeʼ means ‘flowers are vegetablesʼ. 

"flowers" occurs in both the second and third sentences, which means the common word in both those codes has to mean flowers. The common word is "hee", so "flowers" means "hee". This would mean that in the expression " sik hee", which means read flowers", if "hee" means "flowers", then "sik" has to mean "red".  So, the correct choice is option D.