Please help explain #15 why the answer is C

ASThe value of money rises rapidly. as a good store of value and people may resort to barter transactions or C) middle-class savers benefit as prices rise. value remains fixed to the price level; that is, if prices double so does the value of money ing the past two decades an important characteristic of the modern payments system has beer increasing use of A) checks and decreasing use of currency electronic fund transfers commodity monies. D) fiat money as the interest rate increases. The present value ofan expected future payment rises C) is constant D) is unaffected 13) The dollar amount of the yearly coupon payment expressed as a percentage of the face value of led the bond's coupon rate B) maturity rate. C) face value rate. D) payment rate. 14) A discount bond pays the bondholder a fixed amount every period and the face value at maturity. pays the bondholder the face value at maturity. pays all interest and the face value at maturity. D) pays the face value at maturity plus any capital gain. Lla"15) Which of the following S1,000 face-value securities has the highest yield to maturity? A) A 5 percent coupon bond selling for $1,000 B) A 10 percent coupon bond selling for $1,000 A 12 percent coupon bond selling for $1,000 )A 12 percent coupon bond selling for $1,100 16) What is the return on a 5 percent coupon bond that initially sells for $1,000 and sells for $1,2 A) 5 percent B) 10 percent 5 percent D) 25 percent 17) An equal decrease in all bond interst rates A) increases the nri