In which of the following states is the development of rail transport less, due to its geographical conditions?

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Step 1: Understand the requirement — rail transport develops easily on flat terrain and is difficult in mountainous regions.

Step 2: Examine each state:
- $1.$ Sikkim — Located in the Himalayan mountains with steep slopes, high gradients and difficult terrain; rail construction is very limited and expensive (few or no major rail lines historically).
- $2.$ Haryana — Largely flat plains (Indo-Gangetic plain); well-connected by rail.
- $3.$ Bihar — Mostly alluvial plains with dense rail network.
- $4.$ Uttar Pradesh — Broad fertile plains and one of the most heavily rail-connected states.

Conclusion: Among the listed states, Sikkim ($1$) has far less rail development due to its mountainous geographical conditions, so the correct choice is option (a) — 1 only.

FINAL_ANSWER: a

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