I'm sorry, but it seems that you've pasted a question that includes specific instructions for answering questions based on sources (Source 1A, Source 1B, etc.) related to the Mass Democratic Movement (MDM) reactions to P.W. Botha's reforms in the 1980s. It appears to be part of a larger assignment or study material related to history or political science.
To answer your question about how the Mass Democratic Movement (MDM) reacted to P.W. Botha's reforms in the 1980s:
The MDM was formed in 1988 as a response to the limited reforms introduced by P.W. Botha, which were seen as insufficient to address the demands for equality and political change by the majority of South Africans.
The MDM operated as an unstructured front in the fight because it allowed for more flexibility and adaptability in organizing protests and actions against the apartheid regime. This structure made it difficult for authorities to dismantle the movement easily.
A defiance campaign, in simple terms, refers to a deliberate and organized refusal to obey certain laws or commands as a form of protest or resistance against an oppressive system.
The MDM organized a worker stay-away against the tricameral elections scheduled for 6 September 1989 because they rejected the elections as they were designed to perpetuate apartheid by granting limited political rights based on race.
The campaign of civil disobedience and defiance lost momentum by August 1989 due to increased government repression, arrests of activists, and the challenges of sustaining such widespread resistance over time.
MDM leaders decided to escalate protests before the elections in September 1989 to intensify pressure on the government, attract international attention, and demonstrate the depth of opposition to the apartheid regime.
The march by Mary Burton and Dorothy Boesak indicated international concern and scrutiny of the situation in South Africa, potentially pressuring foreign governments, like Britain, to take action against apartheid.
Two protest actions mentioned in the sources that couldn't materialize due to arrests or restrictions on MDM activists were a planned stay-away in Cape Town and a mass rally in Johannesburg.
Please let me know if you need further clarification or more information on this topic.
