Nancy took a breath and gathered her thoughts. She imagined that passing through the gray-zone door into Level 4 was like a space walk, except that instead of going into outer space, you went into inner space, which was full of the pressure of life trying to get inside your suit. People went into Level 4 areas all the time at the Institute, particularly the civilian animal caretakers. But going into a containment zone to perform a necropsy on an animal that had died of an amplified unknown hot agent was something a little different. This was high-hazard work. –The Hot Zone, Richard Preston What is the central idea of this excerpt from The Hot Zone?
Animal necropsies are done only by trained professionals.
People go into Level 4 areas all the time at the Institute.
Entering Level 4 is like going into inner space.
Working in a containment zone is very dangerous.

D). Working in a containment zone is very dangerous.

Explanation:

The central or overarching idea that the author intends to convey through the given excerpt is that 'Working in a containment zone is fatal' as such a zone is 'full of the pressure...to get inside your suit.' The language that the author has chosen to describe the environment of the zone and the phrases like 'amplified unknown hot agent; high-hazard work' clearly substantiate this key idea that the author is highlighting. He calls it 'gray-zone' which emphasizes his idea and he also says 'people went into Level 4 which is like a spacewalk' that discloses the gravity of hazards faced by people working there. Thus, option D is the correct answer as it reveals the key idea of threats and dangers of working containment zones.

answer; i believe that the   correct answer is (d)the use of descriptive words that bring your reader into the story, not using literal words for check luck

paine is arguying that they had tried everything before coming to the conclusion that they needed to fight for their freedom.

argument: "every quiet method for peace hath been ineffectual."

claim 1: "our prayers have been rejected with disdain; and only tended to convince us, that nothing flatters vanity, or confirms obstinacy in kings more than repeated petitioning and nothing hath contributed more than that very measure to make the kings of europe absolute."

claim 2: "wherefore, since nothing but blows will do, for god’s sake, let us come to a final separation, and not leave the next generation to be cutting throats, under the violated unmeaning names of parent and child."