To insert the value "Olsen" as the "LastName" in the "Persons" table using SQL, you can use the following statement:

A. INSERT INTO Persons (LastName) VALUES ('Olsen')

Explanation: Option A is the correct answer because it follows the correct syntax for the INSERT statement in SQL. The statement starts with "INSERT INTO" followed by the table name "Persons". Then, in parentheses, you specify the column name "LastName" where you want to insert the value. Finally, the keyword "VALUES" is used to specify the value you want to insert, which is 'Olsen' in this case.

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