What is the optimum solution to meet the requirements?

Universal Containers (UC) is implementing Sales Cloud. During the last quarter of the financial of the financial year, .. They requested a solution in Salesforce to allow them to specify an assistance agent on the opportunity.. the assistance field. The system should automatically remove access from the previous assistant and ..

What is the optimum solution to meet the requirements?
A . Use share group to share opportunities with the assistant agent.
B. Use opportunity team and create an assistant field, use apex to share opportunities with the assistant
C. Use sharing rule to share opportunities with the assistant agent.
D. Use apex sharing to share and unicast opportunities with the assistant agent.

Answer: B