Which is the clearest transport example among causes of deforestation in the colonial period?

Correct answer: Railway expansion

The direct answer is option A: railway expansion is the clearest transport-related cause of deforestation. Railways needed wooden sleepers beneath tracks, bridge materials, fuel and other construction timber. Step by step: colonial rail lines expanded; large quantities of wood were required; forests near railway routes were cut; timber was transported and used for railway works. Option A is correct because railways directly created a large demand for forest timber. Option B is wrong because a temple festival is a cultural event, not a major transport demand. Option C is wrong because folk drama does not require systematic forest clearing. Option D is wrong because a farming song is not a material need. Exam cue: when transport and deforestation appear together, connect railways with sleepers and timber.