Horseradish Peroxidase Is a Retrograde Tracer

Horseradish peroxidase is a retrograde tracer.This means that if it is injected into

A) axon terminals,it is taken up by the axon and then transported back to the neuron's cell body.
B) dendrite terminals,it is taken up by the dendrite and then transported back to the neuron's cell body.
C) axon receptors,it is taken up by the axons and then transported forward to presynaptic regions of the dendrites.
D) dendritic receptors,it is taken up by the dendrites and then transported forward to presynaptic regions of the axons.