Answer: c)This is an unanticipated problem and not an adverse event.
Explanation: The situation mentioned in the question is regarding the lost record of the last three studies that is blood study, history of infectious disease and stress of job. Therefore, important data is lost in this case.
IRB is giving the order of changing the protocol and sending the record electronically because they work for welfare and protecting the rights and information that collected in a research study .By sending data through secure network , losing information case cannot happen and it can remain secure.
They gave this order because the case is an unexpected issue that can result in the harmful effect..Other options are incorrect because the problem is not expected so it cannot be anticipated and it can possibly have severe effects.Thus,the correct option is option(c).