30 points plus brainliest

table 22.1 labor union membership
year number of members
1933 2,857,000
1934 3,728,000
1935 3,753,000
1936 4,107,000
1937 5,780,000
1938 8,265,000
1939 8,980,000
1940 8,944,000
1941 10,489,000
1942 10,762,000
1943 13,642,000
1944 14,621,000
1945 14,796,000

which event had the most impact on union growth according to the information shown in the chart and your knowledge of history?

a. the increase in the number of women working outside of the home
b. the reduction in wages brought about by the great depression
c. the creation of agricultural unions in the midwest and west
d. the federal government's actions to increase industrial output