Final answer:
If you check the calculations for a licensed friend who has gone into consulting engineering business for himself/herself, your friend assumes all the liability for your work.
Step-by-step explanation:
Completing the sentence, 'If you check the calculations for a licensed (registered) friend who has gone into consulting engineering business for himself/herself:' option D) your friend assumes all the liability for your work is the correct answer.
When you check the calculations for your friend as a non-licensed individual, you are not legally responsible for the accuracy of the calculations or any potential consequences that may arise from them. However, your friend, who is licensed, assumes full liability for your work since he/she is responsible for overseeing and approving all aspects of the consulting engineering business.