One of the main issues for transporting manufactured goods from one place to another was a lack of O Supplies
reliable roads
O Horses

I would say D

Explanation:

I do not know what the context nor the time period is but it sounds like the most reliable answer

well first we can compare on what the slave masters ate and what the slaves ate well the masters ate fancy great food like chicken rice mash potatose and stuff like that and slaves ate well food that your not suppost to eat like the weird parts of turkey and chicken and slaves master chilled beat and eat and slaves work get beat and get little of sleep there you go