Final answer:
When you set up a parameter criterion [Enter state abbreviation] in a query and input "tx", it displays all clients from Texas. This type of query is useful for filtering data based on user input.
Step-by-step explanation:
The question is related to the creation of a parameter query using a database management system like Microsoft Access. In Design view, you can create a parameter query by adding a criterion to the field for which you want to ask the user for input. In this case, it's the State field. The parameter criterion [Enter state abbreviation] will cause a prompt to appear when you run the query, asking the user to input a state abbreviation.
When you type "tx" in the parameter prompt, the query will filter the records to only show clients from the state of Texas, since 'TX' is the standard abbreviation for Texas. This assumes that state abbreviations in the database are in lowercase or that the comparison is not case-sensitive. Hence the correct answer to your question would be A. The query will display all clients from the state of Texas.