Going Skiing Will Cost Adam $80 a Day

Multiple Choice

Going skiing will cost Adam $80 a day.He also loses $40 per day in wages because he has to take time off from work.Adam still decides to go skiing.

A) His decision is rational if Adam's marginal benefit of spending a day skiing is greater than his marginal cost.
B) The $80 price of skiing is a sunk cost and so did not affect Adam's decision.
C) He loses a total of $120 per day, so his decision is irrational.
D) Adam's lost $40 per day in wages is a sunk cost and so did not affect his decision.
E) Adam is definitely making a decision that is in the social interest.