The original term of was descriptive of lower-class people who performed manual labor.

The answer to the question stated above is serf.

The term which describes lower-class people who performed manual labor is serf. 

>Serfs refer to the members of the lowest feudal class, legally bound to a landed estate and required to perform labor for the lord of that estate.

The answer is A) Alliteration.  Most of the words have the letter "w" repeated three times, therefore, it's alliteration.  Hope this helps! :)