A water sample has ppm level concentration of following anions

${\mathrm{F}}^{-}=10; {\mathrm{SO}}_4^{2-}=100; {\mathrm{NO}}_3^{-}=50$

The anion/anions that make/makes the water sample unsuitable for drinking is/are

• A

  Both ${\mathrm{SO}}_4^{2-}$ and ${\mathrm{NO}}_3^{-}$
• Correct answer
  B

  Only ${\mathrm{F}}^{-}$
• C

  Only ${\mathrm{SO}}_4^{2-}$
• D

  Only ${\mathrm{NO}}_3^{-}$

Hence, the correct answer is option: 'B'.