A. suggests that migration in two stages, in her case it involved a shift from domestic to factory work, may still have been common in the 1870s
The involved involves wrong usage of tenses -Hence out
B. suggests that migration in two stages may still have been common in the 1870s, in her case it involved a shift from domestic to factory work
in her case should have come in right after the grandmotherinorder to have the right meaning -Hence out
C. suggesting how migration in two stages, in her case a shift from domestic to factory work, may still have been common in the 1870s
Suggesting is not the right use of tense -Hence out
D. suggests how migration in two stages may still have been common in the 1870s, her case a shift from domestic to factory work
Similar reasoning as B -Hence out
E. suggests that migration in two stages, in her case involving a shift from domestic to factory work, may still have been common in the 1870
It fixes the tense error with addition of involving
Hence IMO E