Locate the section where Montag reflects on Mildred's "second self". Explain what he means by this.
a. Montag reflects on Mildred's "second self" when he observes her interacting with the interactive parlor walls, where she interacts with the characters and becomes emotionally invested in their lives. He means that Mildred becomes disconnected from her own reality and deeply engrossed in the virtual reality created by the parlor walls.

b. Montag reflects on Mildred's "second self" when he sees her engrossed in her seashell radio and taking part in the mindless conversations of her "family" in the seashells. He means that Mildred's true identity and thoughts are being overshadowed by the distractions and superficial interactions of her "second self".

c. Montag reflects on Mildred's "second self" during a conversation with her, where he realizes that she has no recollection of the past and is completely detached from their own shared memories. He means that Mildred's true self has been replaced by a manufactured persona, influenced by the government and technology.

d. Montag reflects on Mildred's "second self" when he witnesses her participating in the empty and superficial conversations with her friends, where they discuss trivial matters and avoid any meaningful discussions. He means that Mildred's true self is being overshadowed by the shallow interactions and superficial relationships in her social circle.