Answer:
White Abolitionists
Step-by-step explanation:
The American Colonization Society is an organization that was founded to return African-Americans back to Africa. Though the option gave four groups of people less likely to support the ACS, in actually, at the beginning the ACS was supported by all of the four groups mentioned. However, black abolitionists, since the very beginning was against the idea of ACS, and not long after its founding, white abolitionists also abandoned the cause in support of the black abolitionists.