They are asking if the existence of the mist in the story is meant to encourage us to disregard the difference between various types of memory and knowledge.
In the book, the mist is there to represent of forgetfulness. It settles on the ground AND in people’s minds too, and that makes them forget things they knew and things that happened recently.
I believe that the idea which is addressed in the passage above is friendship and love.
You can see that there is a strong friendship between Lancelot and Arthur, even though Lancelot is seeing his wife behind his back. On the other hand, we can see the theme of love between Lancelot and Guinevere, even though Arthur is not aware of that.
I think the answer would be statement number 3. Rain barrels comes along with some environmental benefits. It helps you save water. Many people would often squander water to the point that most dams and water suppliers dries up during the summer season.
Subject - roses. Verb- bloom