The invention of the steam engine led to a boom in the
railroad industry.

There is no A B C or D or no true or false, but if this is a true or false question, then yes, this is true.

small european communities with shared traditions consolidated into large new states (apex)

the communist manifesto is an 1848 political pamphlet by the german near the end of the manifesto, the authors call for a "forcible overthrow of all existing social conditions",  ..