In Which of the Following Situations Would Reliance on Routine

In which of the following situations would reliance on routine most benefit performance?

A) When you're performing a task that is familiar and involves few decisions.
B) When you're performing a brand new,unfamiliar task.
C) When you're performing a task that requires frequent choices and adjustments.
D) When you're performing a task for which a routine is available but the current circumstances are ones in which it would be best to avoid the habitual routine.