I believe the answer is: B.migrant workers.
At that time, the migrant workers was forced to live under a horrible condition since there was no laws that regulate company's treatment toward of its employees. Due to the plight of these workers, united farm workers was created in order to create better situation for the migrant workers.
having insufficient income to provide
8 in 1816 & 1820
16 in 1824 & 1828
21 in 1832, 1836 & 1840
23 from 1844 through 1860
21 in 1864 & 1868
22 in 1872, 1876 & 1880
23 from 1884 through 1908
24 from 1912 through 1928
26 in 1932, 1936 & 1940
26 in 1964 & 1968
25 in 1972, 1976 & 1980
23 in 1984 & 1988
21 in 1992, 1996 & 2000
20 in 2004 & 2008
18 in 2012, 2016 & 2020
25 from 1944 through 1960