Answer this correctly and don't guess

dred scott sued for his freedom based on

select the best answer from the choices provided.
a.
the promise that upon death of his first enslaver, he would be freed
b.
past travel to free states with his enslaver
c.
his illegal capture under the fugitive slave law
d.
the kansas-nebraska act

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.

the correct answer is b