Final answer:
The black parallel to the Southern Alliance was the Colored Farmers' National Alliance, formed in 1886 due to exclusion from the Farmers' Alliance and growing to a million members at its peak.
Step-by-step explanation:
The black parallel to the Southern Alliance was A) The Colored Farmers' National Alliance. This organization was established by black farmers in response to their exclusion from the Farmers' Alliance, which focused on issues pertinent to white farmers and ignored the racial challenges and inequalities black farmers faced. Founded in 1886 in Texas, the alliance aimed to improve the conditions and assert the rights of black farmers and rapidly grew to about one million members at its height. Their actions indicated early forms of collective bargaining and unity, such as the boycott against jute producers and other cooperative efforts that crossed racial divisions.