WILL MARK BRAINLIST!! Which is a unique feature of idioms?

They are all outdated and indistinguishable.
They are confusing and complex.
They are particular to distinct times and peoples.
They are distracting to contemporary readers.

How do pip's feelings of guilt in chapter 6 fluctuate? a. he feels both guilty and exhilarated by the opportunity to interact with a convict. b. he doesn't feel any true guilt, but rather fear that he will be caught and self-loathing that he stole. c. he feels guilty, but only until the convict is found. d. he feels guilty for lying to joe, but not for stealing from mrs. joe, because he doesn't love her.