What Is the Proper Order of Events That Need to Take

What is the proper order of events that need to take place in order for classical conditioning to occur?

A) unconditioned response presentation $\rightarrow$ conditioned stimulus presentation, which elicits the unconditioned stimulus $\rightarrow$ after many trials, the unconditioned response elicits the conditioned stimulus
B) conditioned response presentation $\rightarrow$ unconditioned response presentation, which elicits the conditioned response $\rightarrow$ after many trials, the conditioned response elicits the unconditioned stimulus
C) unconditioned stimulus presentation $\rightarrow$ conditioned stimulus presentation, which elicits the conditioned response $\rightarrow$ after many trials, the unconditioned stimulus elicits the unconditioned response
D) conditioned stimulus presentation $\rightarrow$ unconditioned stimulus presentation, which elicits the unconditioned response $\rightarrow$ after many trials, the conditioned stimulus elicits the conditioned response