Discussion question help please

Please no plagiarism and make sure EACH answer is 75-100 words. Please also, make sure you put each question, above each answer.2. Is the marginal social benefit of a good that exhibits positiveexternalities greater or less than the private social benefit of that good?Why?4. Would a high tax on oil significantly reduce the amountof pollution coming from the use of oil? Why or why not?10. Why are both nonexcludability and nonrivalry importantelements of public goods?16. What is the adverse selection problem?