the answer is A) why?

9. (2pt) When asked in an interview what she missed the most because of the time she spent training for the Olympics, a rower revealed that she had given up a job that paid $46,000 per year to train full-time. Previously, she had a food and rent cost of $4000. For training she has received a grant of $12,000 per year from Sports Canada, but this could not cover all her training expenses. Her food and rent were $10,000 per year and training expenses were $8,000 per year. What is the annual opportunity cost, expressed in dollars, to this rower of 'Going for Gold"? $48,000. b) $37,000. $42,000. None of the above