Why not C

@noellerubino, Great question. This is a strengthen with a sufficient premise question. We're looking for the answer choice that, if true, makes the argument valid. The argument is saying P: No building permit and other activities not completed in less time - >no library P: No building permit C: no library This argument isn't valid, but if we add the other sufficient condition of the first premise, we could make it valid. (C) says, "The application for a building permit was submitted on January 2 of this year, and processing building permits always takes at least two months. supported by the study." (C) gives us additional information regarding why the permit will not be obtained by February 1, but we already know that it won't be obtained by February 1, so we are not getting any new information to make the argument valid. As a result, we can get rid of this answer choice. (A) says, "All of the other activities necessary for construction of the library will take at least as much time as originally planned." (A) helps us to satisfy the second sufficient condition of the first premise we were given in the stimulus. With (A), we have enough info to make the conclusion that the library will not be built, so (A) is the correct answer choice. P: No building permit and other activities not completed in less time - >no library P: No building permit P: (A) other activities not completed in less time C: no library Does this make sense? Let us know if you have any more questions!

Ahhhh tricky but yes that totally makes sense!!! Thanks

@noellerubino, great to hear!