another error of A is that we don't know if the papercrete is a promising building material for small-scale construction. All we know is that those who regularly work with it primarily work on small-scale construction and they think the papercrete material is good for large-scale construction, so A is not descriptively accurate

Comparative is the first passage

For some reason I found this passage much easier than the first one......

This is how I interpreted Answer A:

Original: "Not Justified --> No testing"

Contrapositive: "Testing --> Justified".

If we want to negate this, we are going to negate the necessary condition which turns out to be "Testing --> Not justified".

PT 88 Game 3 (flower) & PT 89 Game 4