Roadtrip Enterprises offers two types of guided tours. The Thelma tour has a contribution margin of $30 per passenger. The Louise tour has a contribution margin of $10 per passenger. Roadtrip currently sells equal quantities of both tours. Which of the following will happen if Roadtrip's sales mix changes to 4 Thelmas for each Louise sold? A) Net income will increase if the same total number of tours is sold. B) Total contribution will decrease if the same total number of tours is sold. OC) Total fixed costs will increase. D) The total number of tours required to break even will increase