Final answer:
The statement about Sylvia Robinson being an early MC is false. The colonizationist scheme was unpopular among black abolitionists, and the market revolution truly resulted in vast social and economic changes in the U.S. Margaret Block and Flonzie Brown-Wright were significant figures who spoke out against social injustices.
Step-by-step explanation:
Sylvia Robinson was most notably known as a musician and record producer, and she is not recognized for having an early career as an MC. Therefore, the answer to the statement is false.
Regarding the colonizationist scheme of the early 1800s, it was false that this was popular among black abolitionists. The colonizationist movement, which aimed to relocate free black Americans to Africa, was largely unpopular among them as they considered themselves Americans and wanted to fight against slavery and for their rights within the United States.
The market revolution indeed brought numerous social and economic changes to the United States, including increased production, expansion of markets, and the rise of a national economy. Therefore, the answer to this statement is true.
In the context of prophetic practices of freedom, Margaret Block and Flonzie Brown-Wright were influential local leaders and civil rights activists. They demonstrated these practices through their commitment to speaking out against social injustices and working towards change, as highlighted by Margaret Block's involvement with the SNCC and her critical stance on the SCLC's leadership.