What is the correct interpretation of the slope of the line in this graph?

Algebra 1 Unit 7 lesson 16 Question 14

Question 2 options:

Every hour, the number of liters decreases by 0.5 liter.

It takes 0.5 hour for the water to decrease by one liter.

It takes 0.25 hour for the water to decrease by one liter.

Every hour, the number of liters decreases by 0.25 liter.

The correct interpretation of the slope of the line in this graph is: Every hour, the number of liters decreases by 0.25 liter.