Answer :
The Polish crisis occurred between 1980–1981 and led to the formation of the Solidarity mass movement against the polands arrangement with the Soviet Union.
What is the Polish crisis?
The Polish crisis between 1980–and 1981, led to Solidarity mass movement in the People's Republic against the United Workers' Party and Poland's alignment with the Soviet Union.
In August 1980, strikes resulted in the founding of the independent trade union "Solidarity" led by Wałęsa. The growing strength of the opposition led to the declaration of martial law in December 1981.
Therefore, option d appropriately describes the statement.
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