To answer this question, we need to understand the different types of arguments in programming.
Option A) VARCHAR2 - VARCHAR2 is a data type used to store character strings of variable length. However, it is not directly related to passing values from a procedure to the calling environment.
Option B) BOOLEAN - BOOLEAN is a data type that represents logical values (true or false). Similar to VARCHAR2, it is not specifically used for passing values from a procedure to the calling environment.
Option C) OUT - This option is the correct answer. The OUT parameter is used to pass values from a procedure to the calling environment. It allows the procedure to modify the value of the parameter and return it to the caller.
Option D) IN - The IN parameter is used to pass values from the calling environment to a procedure. It allows the procedure to use the value but does not modify it or return it to the caller.
The correct answer is C) OUT because it is the type of argument that passes a value from a procedure to the calling environment.