It was likely he could face death on charges of heresy.
A hundred years before Luther began his reformation efforts, Czech reformer Jan Hus was put to death by the Roman Catholic Church for being a heretic. There was much fear Luther would be treated like Hus had been treated. Luther had the advantage of having a strong prince in his territory in Saxony who was intent on protecting Luther as one of his subjects, preventing the pope (seen as another ruling prince) from interfering with the sovereignty that Elector Frederick the Wise of Saxony asserted over his domain.
The march primarily focused on gathering support from rural communities which had a high population of Mexican farmworkers. Not only would this march serve as a protest against Reagan and his discriminatory views against Chicanos, but also to garner support for La Raza Unida Party to be on the ballot.
I'm thinking B. But could be wrong:/