The correct answer is: B. Define the circumstances of the problem.
The first step in troubleshooting any problem is to define the problem. This means identifying the symptoms of the problem, when it started occurring, and what changes have been made to the computer recently. Once the problem has been defined, you can start to narrow down the possible causes and solutions.
Option A, checking the computer CMOS, is a possible solution if the problem is related to the computer’s BIOS settings. However, it is not a logical first step, as it is not the most common cause of problems.
Option C, calling the vendor, is a good option if you are not comfortable troubleshooting the problem yourself. However, it is usually best to try to troubleshoot the problem yourself first, as this will help you to learn more about how computers work.
Option D, defining what applications are being used, is a good step to take if you are troubleshooting a problem with a specific application. However, it is not a logical first step, as it is not the most common cause of problems.
Option E, none of the above, is not a correct answer.
In conclusion, the correct answer is: B. Define the circumstances of the problem.