The answer to this is E. There are different problems that exist right now because the signs were not looked into immediately. Some problems are resolved easily because the issues were found and discussed as soon as they become available.
In order to do this type of method, the question of why should be repeated until the root cause is found. There is a need to define the problem, measure just how grave the problem is, analyze how the problem can possibly be resolved and also analyze various details about the problem in general.
Once the problem has been identified, other Whys should still be asked to know how the situation can be improved and how the situation can be under control.