Boot camp for sure sorry if wrong-
To solve this question, we can figure out what each of the words mean (specifically) and then put them into the blank and see which one fits best.
Burning is normally regarding a fire, one very hot and bright.
Sultry means that the air is hot and humid.
Blazing means burn fiercely or brightly.
Thermogenic means tending to produce heat, and it is commonly referring to drugs.
The best word that fits is sultry, so we know that the answer is B, sultry.
True, I know from experince that I myself am not racist but when talking about race with friends it can be uncomfortable on both sides.