Well, it represents their key of achieving their long term dreams. It can also symbolize Walters greed and the destruction to his own original beliefs.
Answer: a is the right sanswer
Explanation: a is correct due to the fact that someone had to make an infrence as to why the bugs got in, so when they infrenece that the bugs had to get in somehow, therefore they concluded that someone left the door open.
Hope this helps
I'd say the last option makes the most sense, to be safe get a second opinion.
