Which leader was responsible for heading up the solitary labor movement that achieved radical reforms in poland during the early 1980's?

there are two main types of historical sources: primary sources and secondary sources. a primary source is something that originates from the past. it can be a chronicle, a piece of pottery, or even a piece of glacial ice that gives us climate data about the levels of atmospheric carbon one thousand years ago.

i need to see the answer to answer the question

your answer would be (a)