One of the Best Ways to Speed Up the Process

One of the best ways to speed up the process of financial analysis and arrive at a good decision is to

A) use estimates of inputs when it appears that finding a very accurate input would take an inordinate amount of time.
B) use estimates backed up by sensitivity analysis when it appears that finding a very accurate input would take an inordinate amount of time.
C) use estimates of inputs except when it appears that finding a very accurate input would take an inordinate amount of time.
D) make sure that every detail is very accurate.
E) none of the above