Answer
option d
100%
Work Step by Step
The Carnot efficiency (𝜂) of a heat engine operating between a hot reservoir at temperature $T_{h}$ and a cold reservoir at temperature $T_{c} $is given by:
$𝜂$ $=$ $1$− $\frac{T_{c}}{T_{h}}$
At absolute zero $T_{c}$=0
$η=1$
This indicates that the efficiency would be 100%, as the engine could convert all the heat absorbed from the hot reservoir into work, with no waste heat going to the cold reservoir.
