Heat is being transferred convectively from a cylindrical nuclear reactor fuel rod of 50mm diameter to water at 750C, under steady state condition, the rate of heat generation within the fuel element is 50 $\times$106 W/m3 and the convective heat transfer coefficient is 1 KW/m2K. the outer surface temperature of the fuel element would be
(a) 7000C (b) 6250C
(c) 5500C (d) 4000C