D.In taking action, one must not worry about success or failure.
Explanation:
The Bhagavad Gita is an epic poem, that is contained on the Mahabharata, which is the longest poem written in any language, the Bhagavad Gita has one of the most important lessons that the Indian society has, wich is when taking action one must not worry about succes or failure, you just have to worry about the morality of your decision and if it is good or bad.
