Answer :
The event that caused the exchange between Abigail and Proctor was Proctor rejecting Abigail's attempts to rekindle their relationship.
What is can lead to a change in an event or a story?
A sudden change in a story can occur when a character takes an unpredicted step which may lead to the elimination of a major character.
Abigail, a servant of Proctor, who expresses her wish to renew an affair with Proctor. He refuses yet Abigail will not relent. This event lead to the death of Proctor.
Therefore, the event that caused the exchange between Abigail and Proctor was proctor rejecting abigail's attempts to rekindle their relationship.
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