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Which of the following statements is incorrect?

(i)  Using good quality seed is the only criterion to get high yield.

(ii) Growing different crops in different seasons in the same field will deplete the nutrients of soil.

(iii) All crop plants are sown as seeds in the field.

(iv) Cells of root nodules of leguminous plants fix nitrogen.

(v) Freshly harvested grains must be dried before storing.

A) i and ii only

B) only iii

C) i, ii, iii and iv

D) All i, ii, iii, iv and v

E) None of these