Recognize functions from tables

Determine whether a table of values of a relationship represents a function.


Li Jing devised a small experiment: she filled up her car's gas tank with varying amounts of fuel (measured in liters), each time measuring the distance (in kilometers) she drove on that tank until it was empty. The results are listed in the table below.
According to the table, can the distance driven be represented as a function of the amount of fuel used?
Please choose from one of the following options.
Fuel (liters)3035403545253020
Distance (kilometers)1001201401201609010080