Rats are presented with tone-shock trials such that there is an increase in conditioned fear when the tone is presented. Which of the following procedures would result in the most long-lasting decrease in fear? options :

a) present the tone 30 times with 30 seconds in between trials

b)present the tone once, wait 5 minutes, then continue presenting the tone 29 times with 30 seconds in between those 29 trials

c)present the tone once, wait 1 day, then continue presenting the tone 29 times with 30 seconds in between those 29 trials

d )present the tone 30 times with 1 minute in between trials

PLEASE HELP