Answer:
This can be classified as an unanticipated problem.
Explanation:
During an investigational drug study the rate of risk of expected adverse events is indicated to be greater than what was initially expected. The current subjects need to be reconsented and the consent form needs to be updated to include this higher rate
Since the rate of an expected adverse event is greater than what was anticipated in the beginning and puts subjects and others at risk, this poses an unanticipated problem.