Final answer:
To rename a field in Datasheet View of the 'Managers' table, switch to Design View, find the 'Manager Email Address' field, and change it to 'Email', then save the table design.
Step-by-step explanation:
To rename the field name of the Manager Email Address field to "Email" in Datasheet View of the Managers table, you should opt for option c), which is Access the Design View and modify the field name. This entails switching from Datasheet View to Design View within the database management system you are using, such as Microsoft Access, finding the field that currently says "Manager Email Address", and then changing it to "Email" directly in the field name box. Once the new name is entered, you'll need to save the table design to apply the changes.