What is the best approach to ensure the assigned reviewer obtains Read/Write access to the record?

Universal Containers implements a private sharing model for the Convention_Attendence_c custom object. As part of a new quality assurance effort, the company created an Event___Reviewer__c user lookup field on the object. Management wants the event reviewer to automatically gain Read/write access to every record they are assigned to.

What is the best approach to ensure the assigned reviewer obtains Read/Write access to the record?
A . Create an After Insert trigger on the Convention Attendee custom object, and use Apex Sharing Reasons and Apex Managed Sharing.
B . Create a Before Insert trigger on the Convention Attendee custom object, and use Apex Sharing Reasons and Apex Managed Sharing.
C . Create a criteria-based sharing rule on the Convention Attendee custom object to share the records the a group of Event Reviewers.
D . Create criteria-based sharing rules on the Convention Attendee custom object to share the records with the Event Reviewers.

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Answer: B