Answer:
C. The Buddha rejected the Caste system.
Step-by-step explanation:
This has to be correct because all of the other answer choices have to do with the religion of Buddhism. The Buddha's religion was centered around the idea that we go through සන්සර (Samsara), or cycles of rebirth, which is reincarnation. The Buddha couldn't have rejected any religion that had to do with meditation because He became enlightened through meditation and He makes meditation a huge part of Buddhism for both monks and lay disciples, encouraging them to center their mind through meditation. The last choice definitely isn't it either because the Buddha's main goal was to spread his teachings and guide his disciples to නිර්වාණය, or Nirvana.
Anyway, one thing I know for sure is that the Buddha rejected the Caste system. He believed all should be treated equally and through compassion, not based on who or where we were from. The Buddha also made sure his teachings were available to everyone, and he never thought about the caste of his disciples. Your caste in this life did not affect what you are inside and what you could realize about life, and the Buddha knew that.
AnYwAy, I'm know this is really late, but hope it helps ツ