To solve this question, the user needs to have knowledge of the Select Case statement and its behavior.

The Select Case statement is a control structure in programming that allows the execution of different code blocks based on the value of a test expression. The test expression is evaluated once, and then the program determines which code block to execute based on the value of the test expression.

Now, let's go through each option and explain why it is right or wrong:

A. Once for each Case: This option is incorrect. The test expression of a Select Case statement is evaluated only once. After evaluating the test expression, the program will execute the code block that matches the value of the test expression and then exit the Select Case statement.

B. It depends on the value of the test expression: This option is incorrect. The test expression of a Select Case statement is evaluated only once, regardless of the value of the test expression. Once the test expression is evaluated, the program will execute the code block that matches the value of the test expression and then exit the Select Case statement.

C. 1: This option is correct. The test expression of a Select Case statement is evaluated only once.

D. 2: This option is incorrect. The test expression of a Select Case statement is evaluated only once, not twice.

The answer is: C