Do not insult the poor.
The above sentence was asked in my exam for voice conversion. I had four options, managed to rule out two of them but confused between these two.
A) Let the poor not be insulted.
B) Let the poor be not insulted.
I tried to find answer to my problem but couldn't find concrete answer. I guess both are same in meaning with just a subtle difference in construction but since its a MCQ question I need to choose one answer, which one should I choose ? Which construction is the better one ? The solution has A as answer but doesn't explain why.