Respuesta :
This is a hard one and I can see why you decided to post it here. B is most definitely wrong but the other three are all neck and neck. There are both even pros and cons of A and C but I think it would be more reasonable to adopt a general routine. So I think the answer would be C.
Answer: C-adopt a general routine so that she can better predict her schedule and plan for the unexpected
Explanation: I think that what Karen needs to do is to find a balance between being flexible to adapt her schedule to these "unexpected tasks" and being organized as to predict in advance most of the activities she has to do every day. From the options given the closest to this balance is option C. I find the other options either too unpredictable or too strict.