Plz
the tables show the cost of different numbers of t-shirts ordered at two different stores, store a and store b:

store a

number
of t-shirts cost (in $)
2 $6
4 $12
8 $24

store b

number
of t-shirts cost (in $)
3 $12
6 $24
9 $36

which of these explains which store has a better buy?

store a, because the ratio of the number to the cost is 3: 1 in store a and 4: 1 in store b

store b, because the ratio of the number to the cost is 2: 8 in store a and 3: 15 in store b

store b, because the ratio of the number to the cost is 8: 2 in store a and 15: 3 in store b

store a, because the ratio of the number to the cost is 1: 3 in store a and 1: 4 in store b