Final answer:
The warning at the beginning of the movie indicates that it is not suitable for children under the age of 13.
Step-by-step explanation:
The warning at the beginning of the movie is usually related to its content and intended audience. In this case, the correct answer is (A) The movie is not suitable for children under the age of 13. This warning indicates that the movie may contain content that is not appropriate for young children and parents should exercise caution when allowing them to view it.