How should the administrator accomplish this?

Ursa Major Solar is noticing a decrease in deals with a cross-sell opportunity type and wants to share all cross-sell opportunities with a team of subject matter experts in their organisation. The company has different roles, and the organisation wide default opportunity is set to private.

How should the administrator accomplish this?
A . Add the subject matter experts to a public group and give them access to records with a criteria based sharing rule.
B . Change the organisation-wide default for opportunity from private to public Read/Write to open up access for subject matter experts.
C . Enable territory management, assign the subject matter experts to the same territory, and give them access to the records with manual sharing.
D . Create a new role for the subject matter experts and give them access to the records with the owner-based sharing rule

Answer: A