All of the following were coerced labor systems utilized by great britain after the 1830s EXCEPT
A. African slavery
B. Chinese contract laborers
C. Indian indentured servitude
D. Australian penal colonies

A. African slavery

Explanation:

Although we know that slavery was an important part of British Empire it was not a part of their system after 1830s. To be precise in 1833, British Empire prohibited slave trade inside their domain. This was in important change, that rearranged the position of the whole Empire.

silk

indigo  

rice

all the other answers are wrong

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.