Answer:
3. Rise and fall theories of social change
Step-by-step explanation:
According to the given article, the evolution of trains are discussed. It is noted that the train was a primary form of transport in the 90s, but with the invention of fast cars and other form of travel, train travel became more obsolete, until recently when there arose a need for it to help with decongestion.
Therefore, the return to rail as a means of transportation illustrates the rise and fall theories of social change