Which of the following is the cause of the error?

You work as a Database Administrator for Domain.com. You have created a table named
Students in the database. Following are the data contained in this table:

You have written the following query to retrieve records from the Students table:
SELECT Stu_ID, Last_Name, SUM(Fees)
FROM Students
WHERE Fees < 3000
GROUP BY Class
ORDER BY Last_Name;
You get an error on executing the query. Which of the following is the cause of the error?

A.
ORDER BY Last_Name

B.
WHERE Fees < 3000

C.
GROUP BY Class

D.
FROM Students