Pls 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.