During experimentation, a presynaptic cell was stimulated while monitoring the response of the postsynaptic neuron. It was noted that the postsynaptic cell hyperpolarized, but did so slowly and over a long period of time. As the investigator, you conclude that the postsynaptic effect was mediated by the binding of a neurotransmitter to which of the following?
A. An ionotropic receptor.
B. There is not enough information to draw a conclusion.
C. A metabotropic receptor.
