An unplastered brickwork has a resistivity of 0.83 m degC/W. For a 230 mm thick brick wall, the inside and outside surface resistances are 0.123 and 0.1 m degC/W respectively. The R-value of the given wall section (in m degC/W) is _____

• A. 0.41
• B. 1.41
• C. 2.41
• D. 3.41