Which activity put heavy pressure on forest timber in the colonial period?

Correct answer: Railway construction

Direct answer: Option D, railway construction, is correct. During the colonial period, railway lines expanded across India. Railways needed wooden sleepers placed under the tracks, and large quantities of timber were also used for bridges, buildings, fuel, and other railway works. Trees were cut in large numbers to supply this demand. Railway construction therefore became a major cause of commercial forestry and deforestation. Option A is wrong because fishing may use local resources but was not the major activity creating this heavy demand for forest timber. Option B is wrong because dyeing cloth mainly required dyes and water, not huge amounts of structural timber. Option C is wrong because flower decoration has no comparable demand for wood. The exact reasoning is: railway expansion → tracks and railway structures → wooden sleepers and other timber → large-scale tree cutting. A common exam cue is ‘railway sleepers’, which immediately points to railway construction. The supplied answer is correct.