In Wheatstone's bridge, $\mathrm{P}=9\mathrm{\Omega },\mathrm{Q}=11\mathrm{\Omega },\mathrm{R}=4\mathrm{\Omega }\mathrm{and}\mathrm{S}=6\mathrm{\Omega }.$ How much resistance must be put in parallel to the resistance S to balance the bridge?

• A

  $24\Omega$

• B

  $\frac{44}{9}\Omega$

• C

  $26.4\Omega$

• D

  $18.7\Omega$