The answer is D: discourages.
<em>noun</em> Deterrence: the action or the fact of <em>deterring (preventing, stopping) </em>people from doing something.
<em>adjective</em> Deterrent: Making someone<em> less likely to do something</em> by making it difficult for them to do it or by making them realize that it will have bad results.
A: <em>encourage</em> is the opposite of discourage.
B:<em> increase</em>: grow, expand, become greater.
C: <em>label</em>: classify, decribe, identify.
