@TMoney I'm glad you said that you mapped it out this way because I did the exact same, which lead me to selecting A. I wish the video covered this option because I'm not confident that it's correct, but it sounds like we both got to the correct answer. While it does say 'only if', which usually indicates a necessary condition, I think the key here is that it says 'BUT only if that component were ALSO comparable'. To me that the use of 'but' and 'also' indicate that it's presenting another sufficient condition that must be met in order for something to be considered 'preferrable.' I read it as 'but only if that component were also comparable to semiconductors in all other significant respects'...... it would be preferrable (implied, but not explicitly stated). I don't think it's saying 'Any A is B, but only if A is also C'. I think it's saying 'if A has B and C then it's D'. Again, not sure if that's correct, but I think the way this one is worded is different than some of the other examples.