Which item saw high demand when railway networks expanded in the nineteenth century?

Correct answer: Timber

Direct answer: A, timber. Nineteenth-century railway construction required wooden sleepers to support the rails. It also required wood for some construction and maintenance needs. Therefore, as railway lines spread, the demand for suitable timber increased and forests were cut to obtain it. B, ghee, is a food product and was not the key material needed for railway sleepers. C, glass bangles are ornaments and have no direct role in building railway tracks. D, a salt statue is not a standard railway material and would not meet construction needs. The key association is simple: rails rest on sleepers, sleepers were commonly made of wood, and expanding railways increased timber demand. Do not confuse the object transported by rail with the material needed to build the railway.