Final answer:
To create a link in the ManagersByState query, drag the ManagerID field from the Managers table to the ManagerID field of the Clients table in Query Design view.
Step-by-step explanation:
To link two tables in the Query Design view, specifically for a query named ManagersByState, you need to create a relationship between the two tables using a common field, in this case, ManagerID. The correct way to link the tables is option a. Drag the ManagerID field from the Managers table to the ManagerID field of the Clients table. This creates a join that tells the database how to find related records in another table. Using the ManagerID field for this connection is essential because it is the common field that exists in both tables and uniquely identifies each manager.