In a Typical Ramachandran Plot, _____ Is Plotted Vs _____ $\varPhi$

Multiple Choice

In a typical Ramachandran plot, _____ is plotted vs _____ to illustrate _______.

A) $\varPhi$ ; $\Psi$ ; dependence of $\Psi$ upon $\varPhi$
B) $\Psi$ ; $\varPhi$ ; dependence of $\varPhi$ upon $\Psi$
C) $\varPhi$ ; $\Psi$ ; allowable combinations of $\Psi$ and $\varPhi$
D) $\Psi$ ; $\varPhi$ ; allowable combinations of $\Psi$ and $\varPhi$
E) none of the above