The transition which could replace the word thus in this sentence is definitely consequently.
Workers bravely set dangerous explosives in the mountains by hand to make passes for railroads, and consequently hundreds lost their lives.
C because a verb is something to describe an action, state, or occurrence.
Same Sex Marriage. One state has it, federal law prohibits it. Many states also prohibit it and prohibit recognizing such a marriage from another state. (In essence violating the full faith and credit clause of the constitution, but there are lots of examples that in law) The US supreme court has not weighed in. So the issue is open. This issue could go lots of ways, depending on what cases get to the supreme court.
In Crusoe's second trip, he characterizes as an adventurous person. It is an adventure that offers him an expense free travel with the captain, and toys and trifles worth 40 Euros for him to carry. He learns a lot from this free trip.
It can identify your target audience
Creating an audience profile, you will be able to see the social and economic characteristics of your audience, that will allow you to identify your target audience.