I'm pretty sure it is B, but if I'm wrong it would be D.
There were many reasons. For starters, the entire economy was based around slaves working on plantations of things like tobacco or for making gin. Without them the state would break down because they wouldn't have the free workforce that they had when they had slaves. Also, it would also help the northern states and abolitionists since there would be more non slave than slave states.
One of the reasons school-age children are faster thinkers and able to filter out distracting information better than younger children is: <span>myelination
</span><span>myelination
Myelination is a process in which human body produce myelin, a substance that increase the productivity in our nervous system which could make us think faster on our feet</span>
The use of negative-emotion words in text messaging is best predicted by the big five trait of "<span>neuroticism".
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Negative emotions can be depicted as any inclination which makes you be hopeless and pitiful. These feelings influence you to detest yourself as well as other people, and take away your certainty. Feelings that can end up negative are detest, outrage, envy and trouble. However, in the correct setting, these sentiments are totally common.