When $NaBH_4$ is dissolved in water,

• A
  It decomposes with the evolution of $H_2$
• B
  $Na^{+}$ and $BH_4^-$ are formed which are stable
• C
  $BH_4^-$ ions formed initially decompose to produce $OH^{-}$ ions,which prevent further decomposition
• D
  $NaH$ and $B_2H_6$ are produced