In the early 1800s, British engineer Richard Trevithick invented the first railway steam locomotive. By 1850,
Britain had more than 6,000 miles of railroad track.

These two events are an example of which type of relationship?

A. Correlation
B. Contextualization
C. Causation
D. Cognation

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.

i think the answer is d

urban people were mostly involved in jobs that required phyisical labor they are paid daily wages (minimum wages) from which they evoke their living. daily wages also mean that the day they don't turn up for work ,even due to sickness, they aren't paid anything.