Answer:
To avoid spam, hate messages, etc.
But, this is weird as you can have unlimited comments.
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.
The correct answer is C.
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