Electrical forces between charges are strongest when the charges are

Closer together

Explanation:

According to coulomb's law electric force between two charges in=s given by

So force between two charges depends on the magnitude of charges and distance between them

From the relation we can see that when distance between charges are less then force will be greater

So for strongest force charges should be closer to each other  

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

think its the third option