Final answer:
The status of a tooth with a porcelain jacket crown is assessed through radiographic appearance, patient history, symptoms, and response to physical examination, not just one singular method.
Step-by-step explanation:
The status of a tooth with a porcelain jacket crown is determined by several factors. These factors include radiographic appearance to identify decay not visible externally, response to electric pulp testing which measures the health of the pulp tissue inside the tooth, response to percussion and palpation which can indicate inflammation or infection in the supporting structures of the tooth, and history and subjective symptoms reported by the patient that may indicate problems not detectable by the other methods mentioned. Hence, a comprehensive evaluation includes not just one, but multiple methods to determine the status of the tooth accurately. The correct answer to the question would therefore be B. (a), (c) and (d).