According to the author, what effect of the slave trade “adds fresh horrors even to the wretchedness of slavery”? people being forced to become Christian
families being separated
people being forced to leave Africa
some people choosing to kill themselves

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.

would be the one having to do with paine talking about how the colonies are so "close" to independence anyway, since he viewed that only rational next step at this point being revolution.