Answer: Elizabeth Van Lew was a successful spy because society did not expect a lady to serve in that role.
Explanation:
The central idea that is implied in this paragraph is that Elizabeth Van Lew was a successful spy because society did not expect a lady to serve in that role.
According to the passage, because Elizabeth Van Lew was a lady worked in her advantage as people didn't suspect her. It was believed that a lady wouldn't become a spy. It was believed that a lady should manage her servants, prepare parties and support her husband but not a spy and this worked in Van Lew's favor.