Select the Word or Phrase That Best Matches the Definition

Select the word or phrase that best matches the definition or example.
-Social stratum that developed in Britain in the nineteenth century and that consisted of people employed in the service sector as clerks,salespeople,secretaries,police officers,and the like;by 1900,this group comprised about 20 percent of Britain's population.

A) steam engine
B) Indian cotton textiles
C) middle-class values
D) lower middle class
E) Karl Marx
F) Ellen Johnston
G) Labour Party
H) Luddites
I) socialism in the United States
J) Progressives
K) Russian Revolution of 1905
L) caudillos
M) Latin American export boom
N) Mexican Revolution
O) dependent development