"really shitty hearing" made me lol

@christianranalli77 I agree, I thought the author was referring to disposing of the bulbs as "burning." I have also not ever encountered that as a verb ever. I guess that wouldn't make sense though, to burn bulbs as disposal.

Maybe the author was trying to trick us with the use of that word.

Same for me.

@adzir thanks

edit: #3

#2: How were we supposed to know that "THE only" introduces a sufficient condition (Group 1) instead of a necessary condition (Group 2)? Where in the lessons leading to this point was this stated or implied? Thanks.