More than 130,000 Arabs had immigrated to the United States as part of the Great Migration and lived and worked across the breadth of the united states fighting its many wars and engaged in the transformative debates that raged throughout this time period.
A. Arabs had immigrated to the United States as part of the Great Migration, and lived and worked across the breadth of United states, fighting its many wars and engaged
B. Arabs immigrated to the United States as part of the Great Migration, and lived and worked across the breadth of United states, fighting its many wars and engaging
C. Arabs immigrated to the United States ,and had lived and worked across the breadth of United states, fighting its many wars as part of the Great Migration and engaging
D. Arabs immigrated to the United States, and lived and worked across the breadth of United states as part of the Great Migration, fighting its many wars and engaged
E. Arabs had immigrated to the United States as part of the Great Migration, and lived and worked across the breadth of United states, fighting its many wars and engaging
The correct choice is B. In B, it seems that 'immigrated', 'lived', and 'worked' parallel way. If this is the case i am just confused how we used COMMA after the word 'migration'.