Organisation structure is primarily concerned with . . . . . . . . and . . . . . . . . of tasks and authority.

The correct answer is: A. allocation and delegation.

Organisation structure is primarily concerned with the allocation and delegation of tasks and authority. This means that it is concerned with how tasks are divided up among different people and groups within the organisation, and how authority is given to those people and groups to carry out those tasks.

Option B, allocation and apportionment, is incorrect because apportionment is not a term that is used in the context of organisation structure.

Option C, reporting and delegating, is incorrect because reporting is not the same as delegation. Reporting is the process of providing information to someone else, while delegation is the process of giving someone else the authority to carry out a task.

Option D, setting standards and delegation, is incorrect because setting standards is not the same as delegation. Setting standards is the process of defining what is expected of someone, while delegation is the process of giving someone else the authority to carry out a task.