The tables show the cost of different numbers of t-shirts ordered at two different stores, Store C and Store D: Store C Number of T-shirts Cost (in $) 2 $12 4 $24 8 $48 Store D Number of T-shirts Cost (in $) 3 $21 6 $42 9 $63 Which of these explains which store has a better buy? (5 points) a Store C, because the ratio of the number to the cost is 6:1 in Store C and 7:1 in Store D. b Store C, because the ratio of the number to the cost is 1:6 in Store C and 1:7 in Store D. c Store D, because the ratio of the number to the cost is 2:14 in Store C and 3:24 in Store D. d Store D, because the ratio of the number to the cost is 14:2 in Store C and 24:3 in Store D.