Treatment with lime can remove hardness of water caused by

• A

  ${\mathrm{CaCl}}_2$
• B

  ${\mathrm{CaSO}}_4$
• Correct answer
  C

   $\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$
• D

  ${\mathrm{CaCO}}_3$

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