According to Oracle documentation2, you should create a Data Access Set that allows access to the UK Ledger to allow users with the General Accountant job role to access the UK Ledger. A Data Access Set is a security feature that defines the ledgers and balancing segment values that a user can access. You can assign Data Access Sets to users or roles using the Manage Data Access for Users page. Therefore, option B is correct. Option A is incorrect because assigning the security context value of UK Ledger to the user/role combination does not enable access to the ledger. Option C is incorrect because assigning the General Accounting Manager role to those users does not enable access to the ledger. Option D is incorrect because assigning the UK reference set to the user/role combination does not enable access to the ledger.