<u>London Underground Railway was a huge success because of the following reasons I'm telling you ---</u>
1. The <u>population</u> of London <u>increased</u> dramatically because many people migrated from villages to the city in search of work.
2. People of the city were <u>accommodated outside the city</u> in family cottages, while the <u>industrial places</u> where they worked were <u>located on the inside</u> of London.
3. Some form of transport was needed so that people could commute from home to work and back home, and the Underground Railway helped in that a lot, because it was the only mode of transport which <u>carried a large number of people in a short span of time</u>.
4. Although the railway was discouraged earlier because people complained of suffocation, it became a huge success because it was <u>the only way of connecting their homes with their workplace</u>.
Hope I helped!
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National border is the type of border among the following choices given in the question that would likely have the most protection. The correct option among all the options that are given in the question is the third option or the penultimate option. I hope the answer helps you.