In history such as World History? You should be able to distinguish the trends and differences in different periods say "Period 1 vs. Period 2" where each period represents a different range of years (in AP World History I learned it with 6 periods but it varies from year to year of when it is taught)
D. u.s. workers will lose their jobs
What do you mean by supply and demand? you want me to explain what supply and demand is?
B. Weakened
Overtiredness has a negative effect on driving capabilities.
Hope this helps!!