It is given in the question that
The temperature measured in Kelvin (K) is the temperature measured in Celsius (C) increased by 273.15. This can be modeled by the equation
[tex]K = C + 273.15[/tex]
To solve for C, we need to get rid of 273.15 and for that we do subtraction, that is
[tex]C = K -273.15[/tex]
Correct option is the first option .