Graphs you see..
a) the relationship between different independent variables
b) the relationship between the independent variable and the dependent variable/s
c) the relationship between different dependent variables
d) the change in data over time

I think it's B because when you graph you do see the relationship between the dependent and independent variable

It should be d if not then c

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.