Urea is an important
fertilisers
The explanation for the correct option:
(C)Urea: Fertilisers are used to increase the fertility of soil one the fertiliser is Urea ,Ammonium Sulphate etc.
The explanation for the incorrect option:
(A) Fuel: It is used for cooking heating, electricity, and in our vehicles
(B) Preservatives: It is used to prevent or retard cause of chemical changes such as oxidation and rancidity
(D) Food items: It is obtained from plants and animals which contain essential nutrients such as minerals, vitamins, and fats.
Thus, The option (C) is the correct answer urea is used as fertilisers.