Final answer:
Brand B costs less per shirt by $0.39 in comparison to Brand A. Correct option is C.
Step-by-step explanation:
In order to determine which brand of shirt costs less per shirt, we need to calculate the cost per shirt for each brand. Brand A is selling 2 shirts for $28.56, so the cost per shirt is $28.56 / 2 = $14.28. Brand B is selling 3 shirts for $41.67, so the cost per shirt is $41.67 / 3 = $13.89.
Therefore, Brand B costs less per shirt by $14.28 - $13.89 = $0.39.
So the correct answer is C. Brand B, $3.75 less per shirt.