Grains produced at a large scale can be stored in (a) Silos (b) Jute bags (c) Granaries (d) Both (a) and (c)

The given options for storing grains at a large scale are: (a) Silos (b) Jute bags (c) Granaries (d) Both (a) and (c) In order to identify which option is appropriate for large scale grain storage, it is necessary to understand what each option entails and their typical use.

(a) Silos: A silo is a large storage structure often used in agriculture for bulk storage of grains, forage, and other materials. Silos are well suited for large scale storage because they can hold a significant amount of grain, have proper ventilation, and can help maintain the quality of the grains. (b) Jute bags: Jute is a natural fiber and jute bags are typically biodegradable and environment friendly. They can be used to store smaller quantities of grains, but they are not practical for large scale storage as they require a lot more space and handling. (c) Granaries: A granary is a large storage structure specifically designed to store grains. They are typically used for large scale storage and can help maintain the quality of grains during storage.

Considering the information in steps 1 and 2, the most appropriate ways to store grains at a large scale are silos and granaries. Therefore, the correct answer is: (d) Both (a) and (c)