Refer to the table. The marginal cost and marginal benefit of stadium B (relative to A) are:

Answer the question on the basis of the following table that shows the total costs and total benefits facing a city of five different potential baseball stadiums of increasing size. All figures are in millions of dollars.



A. $20 million and $50 million, respectively.

B. $100 million and $200 million, respectively.

C. $30 million and $50 million, respectively.

D. $20 million and $60 million, respectively.

D. $20 million and $60 million, respectively.