The force between them is such that like charges repel and opposite charges attract. For example, two positive charges brought near each other will be pushed away from each other. On the other hand, one positive charge and one negative charge brought near each other will be pulled towards each other.
It led to recognition of post-traumatic stress as a legitimate psychological ailment
By exposing the citizen armies of Europe to prolonged and extreme
danger, World War One generated psychological casualties on an
industrial scale. This, in turn, created a military crisis that drew
doctors from a diverse range of specialties into the field of mental
health; never before had so much attention been focused on a single
psychiatric disorder.
The battle of Gettysburg was fought to get food for general lees men who had just been through a long winter.
Your answer would have to be C) The end of Athens's Golden Age. Hope this answers your question.