Which Zone is the largest in Indian Railways?

Answer: Option B

The correct answer is Option B: Northern Railway.

Let's break down why:

* Indian Railways is divided into zones, much like how a country might be divided into states or provinces.
* Each zone manages the railway operations within its designated geographical area.
* The question asks which of the listed zones is the largest.
* Northern Railway covers a significantly large area compared to the others, stretching across several northern states of India.
* While Central, Eastern, and Western Railways are important zones, they don't cover as much geographical area as Northern Railway.
* So, remember, when thinking about the largest zone in Indian Railways, think of the vast expanse of the Northern Railway.