But in answer C, " there are problems ... that no ... preparation will help" actually means that there are some "imp-reparable" problems about which we try to solve, parallel to the "imperceptible" material objects about which we have beliefs in the stimulus, so why C i...

I was thrown off because I thought the position in the first sentence, 'Some argue that laws are instituted at least in part to help establish a particular moral fabric in society', was being argued against (the 'But' indicator to start the following sentence gave me that impression). In that case,...

In B) "A diagnosis test .... can still provide..", "can" make it the general " a diagnosis test" apply to this specific test. "Can" actually make it more general, the same as "at least", is a typical "necessary" answer. It is like "at ...