those four questions, would you mind explain why? I have the answers but not really sure why. Thank you so much, I appreciate it.

12) In the overlapping generations model studied with the population growing and holding constant the stock of money, indicate which ensues? A) The market economy achieves the Golden Rule. B) The rate of money return exceeds one. C) Deflation D) All of the above 13) With the money stock growing and assuming that the endowment of the young is time, the following consequence(s) proceed: A) The youngs' desire to work increases. B) The youngs' leisure consumption increases C) The youngs' demand for money increases D) All of the above. 14) When the government prints money and gives it to the old as a subsidy-gift then, A) The gift has no cost. B) The cost of the gift is the inflation tax C) The cost of the gift is the needless savings on the use of money D) A and B E) B and C 15) If the government sends checks paying $ 2,000.00 to middle and upper-middle-class earning yearly up to $ 150,000.00, then the following consequences arise: A) Wealth of recipients increases. B) Most of the money is saved. C) Consumption in the present rises marginally. D) Savings today are used to finance consumption in the future. E) All of the above