Answer: Third option is correct.
Explanation:
Since we have given that
Number of pounds = 8
Cost of bananas = $3.12
Unit rate would be

Number of pounds = 9
Cost of bananas = $3.06
Unit rate would be

Difference between two unit rates would be

so, the rate for the first store is $0.05 per pound more than the second store.
Hence, Third option is correct.