<span>Melissa's thumb sucking is actually two independent responses to a traumatic event. It could be both responses present at once, or it could be one or the other, however, this can not be properly analyzed without a psychiatric analysis. The two responses thus far that can be inferred are: a reverting back to an infantile state as a coping or avoidance mechanism, and/or a Post Traumatic Stress Disorder induced reaction that is either a coupling to the infantile state or completely independent of it.</span>
Answer: the correct answer is D) encourages a private solution to a particular positive-externality problem.
Explanation: it encourages a private solution because the government reduces taxes if private companies donate to charities. Donating to charities is a positive externality because it contributes to the common welfare of a country.
