Final answer:
The SQL query to display only medical insurance plans is to type "Medical" in the Criteria row in the InsuranceType column and run the query.
Step-by-step explanation:
The correct SQL query to display only medical insurance plans is option a. Type "Medical" in the Criteria row in the InsuranceType column. On the Query Tools Design tab, in the Results group, click the Run button. This will filter the records where the classification is Medical.