Final answer:
Option A, 4 cars for $12, is the better buy because it has a lower unit price of $3 per car, compared to option B, which has a unit price of approximately $3.67 per car.
Step-by-step explanation:
To determine which is the better buy between 4 cars for $12 and 3 cars for $11, we need to calculate the unit price for each option. For option A, the unit price is $12 divided by 4, which equals $3 per car. For option B, the unit price is $11 divided by 3, which is approximately $3.67 per car. Therefore, option A offers a lower unit price, making it the better buy.