Please help it’s important

not 100% sure but I think its the first one, the west benefited from increased travel an tourism.  

Explanation:

before the rail road it was very hard to get to the west,( extreme weather, raiding natives, scarce food etc.) but still many people wanted to see the west. the rail road provided a solution to most of the problems with traveling. and people jumped on (get it) the opportunity.  

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.