The resistances in the two arms of the meter bridge are \[5\Omega \] and \[R\Omega \], respectively. When the resistance R is shunted with an equal resistance, the new balance point is at \[1.6{{l}_{1}}.\]The resistance ?R? is:

• A. \[10\Omega \]
• B. \[15\Omega \]
• C. \[20\Omega \]
• D. \[25\Omega \]