PLS HELP FIRST ONE WILL GET BRAINIEST

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?
Store C, because the ratio of the number to the cost is 6:1 in Store C and 7:1 in Store D.
Store C, because the ratio of the number to the cost is 1:6 in Store C and 1:7 in Store D.
Store D, because the ratio of the number to the cost is 2:14 in Store C and 3:24 in Store D.
Store D, because the ratio of the number to the cost is 14:2 in Store C and 24:3 in Store D.