The factor which is most unlikely to present a barrier to entry into a market is deregulation.
Deregulation is the removal or reduction of regulations in order to help stabilise an economy or to give traders a free market
As a result of this, we can see that deregulation does not present a barrier to entry in a market because of the removal of government barriers which otherwise would have made things difficult for a person to get into a market.
Therefore, the correct answer is option D
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