Answer:
In the graph, the axis of the dependent variable is the ordinate, corresponding to Flow rate (option A).
Step-by-step explanation:
The graph shows the relationship between the flow rate and temperature, a relationship that is directly proportional: the higher the temperature, the greater the flow rate.
The dependent variable, in the case shown, is the flow rate. This variable is influenced by the independent variable, temperature, which has not been influenced by other variables.