If "Rt" is the resistance of a coil of copper at t° C and RT Is the resistance at To C and also the resistance temperature coefficient of copper per degree centigrade at 0°C is 1/234.45, then Rt/RT

A ) (1 + t) / (l + T)

B ) (1+ 234.45t) / (1+234.45 T)

C ) (234.45 + t) / (234.45 + T) ✅

D ) (234.45 + t2) / (234.45 + T2)