Ronnie should be diagnosed with Bipolar ii, so the correct answer would be C!
To start with, I've seen Samantha and Samandhi. And Samadhi Sutta, which interestingly discusses tranquillity and insight ( samatha and vipassana ).
There's another sutta which says that samatha and vipassana are paired qualities - samatha gets rid of passion, vipassana gets rid of delusion ( I'll see if I can find it ). Note that samatha is a quality, not a method.
A sandblasted rock could be different in color because sandblasting takes the top layer of the rock (which has been weathered) off.