If boiling point of some oil is $300{}^0$C, then what will be the boiling point of the oil on Kelvin scale?

The correct option is C 573 K
The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.
Degree Celcius and Kelvin are the units to measure temperature.

$T\left(K\right)=273+t^{\circ }C$
$0{}^0$C = 273 K
So, $300{}^0$C = 300 + 273 K = 573 K
Thus, boiling point of the oil is 573 K.