Answer:
Option A "shadow" an owner for several days to see what's really involved.
Step-by-step explanation:
The best way to know if particular business is a good fit is to really get ourselves involve in it as a shadow owner for a few days. On one hand, this can give us some first hand experience of what the business is about and on another hand this doesn't need to invest too long time to try it.
Speaking to customer and taking personality test merely serve as the secondary sources to support out decision making process to see if a business is a good fit for us.