It can be proven using objective evidence
Will not: won't
would not: wouldn't
who are: who're
were not: weren't
I have: I've
were not: ^^^^^
let us: let's
he has: he's
<span>B) Since passengers on the train are unable to exit and reenter at the city stops.
This is a dependent clause, a fragment by itself.
C is a complete sentence - subject (the train) and verb (can be) and modifier (a convenient way to travel). </span>
