What does "it" refer to ?

Hi~ In the following sentence underlined, what do you think the pronoun "it" refers to?

The amygdala OR alternative behaviors ?

It seems that grammtically "it" should refer to "The amygdala" but it doesn't make sense to me.

Does that make sense to you? OR should the pronoun "it" be changed to "them", which means "alternative behaviors"?

Thanks for your help in advance~

The recommended approach based on the latest brain research is to teach
replacement behaviors so that they can be practiced with regularity while
the student is calm. Asking a student to engage in an alternative practice
only when they are aroused is not only unfair but also irrational. The student
never practices the behavior when he or she is most capable of being
successful—when calm. Also, the replacement behavior is not accessible
during periods of arousal because it is held in the part of the brain that
is not accessible during a crisis. The amygdala must value alternative
behaviors for it to be reinforced by dopamine. Therefore, the design for
successfully establishing replacement behaviors must meet the elements
found in the research that promote the emotional value and chemical
reinforcement.