The watershed General Motors sit$-$down strike started in December $1936$ when $\_\_\_\_\_.$

Multiple choice question.

open battles between strikers and company$-$paid police that occurred as part of a six$-$month coal strike in eastern Pennsylvania

General Motors cut wages by an average of $28$ percent and laid off about one$-$quarter of the workers during the Great Depression

workers in Flint, Michigan, took over two Chevrolet plants by sitting down and refusing to work or vacate the plant

workers at the Triumph Motorcycles factory at Meriden, West Midlands, locked the owners and sat down refusing to work