Concept:All three statements need to be checked as true or false before deciding which one is NOT correct.
Explanation:Statement I is correct.
The Indo-Gangetic-Brahmaputra Plain is widely considered the largest alluvial tract of the world.
Statement II is correct.
The western boundary of this plain is generally marked by the Sulaiman and Kirthar ranges.
Statement III is correct.
The fertile alluvial soil, adequate water supply, and suitable warm-humid climate make this plain highly suited for sugarcane cultivation.
Since all three statements are factually correct, no statement can be called NOT correct.
Answer:None of the given options (A, B, C, or D) is correct because all the statements are correct. The question or option set contains an inconsistency.