Zoe keeps track of the miles per gallon her car gets per week. She has accumulated the following data:

(1, 24), (2, 24.38), (3, 24.76), (4, 25.14)

What is the common difference or ratio?

The common difference is 0.38.
The common difference is 0.76.
The common ratio is 0.99.
The common ratio is 1.02.