For question #5, would "But this is not a sustainable, long term solution," not be considered a sub-conclusion because it gives support to "Since none of them have devised a suitable recycling or disposal plan..." but does not actually receive support from anything?

#feedback Would love more detailed video explanations and more responses to the questions below the videos. It seems like for the past 3-4 skill builder lessons, there has been one question that's very confusing for many of us. I immediately check the questions below the video and can see many have asked for an explanation as to why the answer is correct, but there has not been a 7Sage response for months. I'm a new user so apologies if I am missing something. Is there a better place to find more detailed answers? I don't want to move on if I am confused, but I am also not sure if the videos or questions will ever be updated/answered. Thank you!