Hey, I was doing the StrengthenX question 3 from Chapter 9 of the LRB (the one about navigation system interference in planes), and noticed that (the correct) answer choice E was deemed not to strengthen the argument because "The fact that A and B become popular at the same time does not offer any supporting evidence to the contention that A causes B". However, a couple pages prior, when the methods of strengthening an argument are laid out, one of the methods involves "Showing that when the cause occurs, the effect occurs"
I know I'm misinterpreting one of these guidelines but am unsure of which.
I found a link the the same explanation of the question as is in the bible: viewtopic.php?t=31927
Essentially, howcome answer choice E does not fall into Type B?