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.
I'm not sure if there were supposed to be options for us to choose from along with this question, but one conflict that arose during the Civil Rights Movement was segregation or Jim Crowe Laws.
The pamphlet seeks to engage Americans in the fight against the British. Indeed, Paine wrote The American Crisis pamphlets during the early stages of the American Revolution that were very unfavorable to Americans and when their cause seemed more uncertain than ever. Support for the Revolution was waning and Paine intended to galvanize it in order to facilitate a turnaround of the current situation.
The analogy of winter intends to show the reader that as winter gives way to the new life of Spring, the initial struggles and defeats of the American Revolution would give life to victory. The use of the terms hope and virtue intend to show Americans that this was a just war against tyranny and that the alternative to victory was the death of democracy.