Which line of the following statements will produce error?

This question asks you to identify which line of code will cause an error when running in a MySQL database. Let's break down each option:
Option A: SELECT * FROM person WHERE person_id=1;
This statement is a standard way to retrieve all data (*) from a table named "person" where the "person_id" column equals 1. This is a valid SQL query and will not produce an error.
Option B: SELECT pname FROM person;
This statement retrieves only the "pname" (presumably "person name") column from the "person" table. This is a valid SQL query and will not produce an error.
Option C: SELECT pname, lname, person_id FROM person;
This statement retrieves multiple columns ("pname", "lname", and "person_id") from the "person" table. This is a valid SQL query and will not produce an error.
Option D: None of the mentioned
Since options A, B, and C are all valid SQL queries, the correct answer is Option D: None of the mentioned.