The current stock price of a share is USD 100 and the continuously
  compounding risk-free rate is 12% per year. The maximum possible prices
  for a 3-month European call option, American call option, European put
  option, and American put option, all with strike price of USD 90, are:
  A.100, 100, 87.34, 90
  B.100, 100, 90, 90
  C.97.04, 100, 90, 90
  D.97.04, 97.04, 87.34, 87.34
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