Biochemistry necklace - which one would you choose?

Dope

... They are all on the sand necklace. I choose the necklace.

Acetylcholine

The way these chemicals work is a bit more complicated than just producing specific emotions, for example, dopamine is made to reinforce reward-seeking behavior. Say you have a slice of pie; your brain makes dopamine to trigger happiness, which will make you want more pie at the next opportunity.

dopamine

Acetylcholine

-♁_♁- why not all of them?