Wilson began watering his garden with a watering can that was completely full. The amount of water in the can as Wilson was watering can be represented by a linear function and is shown in the graph below. Which statement is correct?

A graph titled Amount of Water in Wilson's Watering Can has time (seconds) on the x-axis and amount of water (gallons) on the y-axis. A line goes through points (0, 2.5), (1, 2.3), (2, 2.1), (3, 1.9), and (4, 1.7).
The amount of water originally in Wilson’s can was 0 gallons.
The amount of water originally in Wilson’s can was 2.5 gallons.
Wilson is watering his garden at a rate of 0 gallons per second.
Wilson is watering his garden at a rate of 2.5 gallons per second.