Final answer:
The PCT should document the observation and report to the nurse.
Step-by-step explanation:
The PCT should take option B) Document the observation and report to the nurse. New bruises on an older adult patient could be a sign of abuse or neglect, and it is important to document the observation and report it to the nurse or healthcare provider. Ignoring the bruises (option A) is not recommended as it may put the patient's safety at risk. Applying cold compresses (option C) may be helpful for relieving pain and swelling, but it is not the primary action to take. Asking the patient about the cause of the bruises (option D) may be appropriate, but it should be done in a sensitive and non-accusatory manner after reporting the observation.