Final answer:
The Wet Bulb Globe Temperature (WBGT) guide, which is not listed among the options, is what quantifies overall heat stress, factoring in humidity, radiant heat, and air temperature.
Step-by-step explanation:
To quantify the overall heat stress associated with any environment, the Wet Bulb Globe Temperature (WBGT) guide was developed.
This assessment tool is not listed among the given options, so the correct answer is d. None of these answers is correct.
The WBGT takes into consideration not only humidity, as measured by the wet bulb temperature, but also the radiant heat (black globe temperature) and the air temperature (dry bulb temperature), to provide a more comprehensive measure of heat stress on the human body.