I believe the answer is A. An 8-hour day. Hope this helps.
Caliphs are associated with the religion of "Islam," since these are Islamic leaders who are in charge of many different aspects of the entire Muslim community.
Wiki sais "<span>States and </span>school<span> districts </span>did <span>little to reduce </span>segregation<span>, and </span>schools<span> ... The study found that minority students </span>became<span> more isolated and less"</span>
