Sol-air temperature for a wall of absorptivity 0.9, exposed to ambient temperature of $$35^\circ C$$, solar radiation of 260 W/sqm, outside heat transfer coefficient 23 W/sqm K is

A

$$45.2^\circ C$$

B

$$48^\circ C$$

C

$$41.2^\circ C$$

D

$$47.2^\circ C$$