People who came from Missouri to disrupt the Kansas election to decide between free and slave were called border ruffians. Thus, option (D) is correct.
Slaves are those who work for their owners and are the considered as the property of the owners. They have performed all the task demanded by their owners. They have no freedom and suppose to work on the fields without being paid.
Furthermore, they are just provided with the necessities of life that food, shelter and clothing. Apart from it, they are not given wages or salary for their work. They are deprived of their basic rights and to follow all the rules of the owners without revolting against them.
Border ruffians were people who traveled from Missouri to interfere with the Kansas vote on whether to be a slave or a free person. Therefore, it can be concluded that option (D) is correct.
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