The correct answer is D. The employee has the obligation to notify his or her supervisor if they don't feel sufficiently familiar to be competent. This is the correct answer because the employee has a responsibility to ensure they are properly trained and familiar with the engine room equipment and operations before being expected to perform their duties. They should not simply go through the motions or have their training records filled out regardless of their actual familiarity. By notifying their supervisor if they feel insufficiently trained, they can ensure they receive the proper familiarization training to become competent. The other options are incorrect because they either suggest the training is insufficient or unnecessary, or that the employee should not worry about their level of familiarity, which goes against the employee's duty to ensure they are properly prepared.