When is it necessary to notify the DVLA?

Answer: C — Change in name or address

It is necessary to notify the DVLA when there is a change in name or address. This ensures that the proper information is on file and allows for updated documents, such as your driver's license, to be sent to the correct address. In contrast, notifying the DVLA about a change in marital status, job, or school is not necessary as it does not directly affect your personal information or driving privileges. Therefore, these options are incorrect and not necessary to notify the DVLA about.