Answer:
Diligent and hard-working
Step-by-step explanation:
If we were to look for the word "industrious" in a dictionary, we would learn that it refers to someone who is diligent and hard-working. However, if we do not have a dictionary close by, we can also try to guess the meaning of the word based on context. In this case, it is being applied to DuBois because of all the difficult work he did when it came to civil rights.