In hilly areas, railway lines are laid through:

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Gaps

Low hills

Tunnels

All of the above

answer is D.

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Detailed Solution

1)      Railway lines lay through gaps, lowliness, and tunnels in the hilly areas.
2)      India has a variety of landforms making up the entire subcontinent. The plateaus, plains, mountains, and islands are some of the prominent landforms.
3)      India, a large country, needs multiple transportation methods to ensure connectivity between different parts.
4)      Railways form a transportation network for this purpose. However, it is tough to construct railway tracks through the hilly and plateau regions.
5)      Recent developments have facilitated the smooth movement of goods and passengers through these regions.
6)      The first development of railway lines was during the British period to gain control over the prominent mountain ranges of India.

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