Axons from mpfc neurons synapse onto intercalated cells in the amygdala that contain the neurotransmitter
a. gaba
b. glutamate
c. dopamine
d. serotonin

The medial pre Frontal Cortex neurons synapting with the intercalated cells of Amygdala contains GABA as the neurotransmitter.

Option a

Explanation:

The Amygdala has two types of nerve cells getting attached with it primarily. They are the fibres from the mPFC or medial pre Frontal Cortex and the vIPAG or ventrolateral periaqueductal grey. These neurons do have different functions on the whole body.

The fibres from the mPFC do have emotional function on the human body whereas the fibres of vIPAG do have an effect on the muscle tone . And it's seen that both the nerve fibres that are getting attached with the intercalated cells of Amygdala do secrete GABA and are inhibitory GAB Anergic in nature.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)