The correct answer is C. Select query.

A select query is a type of query that retrieves data from a database. It is the most common type of query and is used to select specific rows and columns from a table.

A search query is a type of query that is used to find data in a database. It is used to search for specific words or phrases in a database.

A cross tab query is a type of query that is used to summarize data from a database. It is used to create a table that shows the totals of a particular field for each group of records.

An update query is a type of query that is used to change data in a database. It is used to update the values of fields in a table.

In this case, the question is "Which employees earn more than $5000 a month?". This is a question about specific data, so a select query is the most appropriate type of query to use. A select query will retrieve the data from the database that matches the criteria specified in the query. In this case, the criteria is that the employees earn more than $5000 a month.