I think it means you judge people without even allowing them to say anything.
Overall, Thoreau wanted to prove that not everyone will easily flow with the rules of society. As a result, he calls the people who go different paths than the ones of society "different drummers."
In conclusion, your final answer should be A.
Eliza's appearance as a prim and proper beautiful young lady coupled with her perfect English accent surprised the guests; and they began to speculate as to where she came from. As they listened to her talk, they found her weird but Prof. Higgins explained that it was the "new small talk."
