In The Glass Menagerie, even though Tom works to support his mother and sister, his mother treats him as though he is still a young boy. Which detail from the play best supports this inference?

AMANDA: "Sounds to me like a fairly responsible job, the sort of a job you would be in if you just had more get-up."

AMANDA: "Where is your muffler? Put your wool muffler on! [He snatches it angrily from the closet and tosses it around his neck and pulls both ends tight.]"

AMANDA: "You smoke too much. A pack a day at fifteen cents a pack. How much would that amount to in a month? Thirty times fifteen is how much, Tom?"

AMANDA: "A secret, huh? Well, I won't tell mine either. I will be just as mysterious as you."