Among the following temperatures, the highest is

Among the given temperature we have to evaluate highest temperature.

Let us convert the given temperatures in to same scale

i)$100\text{K}=100-273°\text{C}=-173°\text{C}$

ii)$-13°\text{F}$

$\text{C}=\frac{5}{9}\left(-13-32\right)=\frac{5}{9}\times -45=-25°\text{C}$

iii) $-20°C$

iv)$-23°\text{C}$

we can have $-20°C$ is highest among the given temperatures.