Read the excerpt from The Hot Zone.

There she met Lieutenant Colonel Trotter, a stocky,

dark-haired man whom Nancy had worked with for

many years. They put on their inner gloves and taped

their cuffs. Nancy put a pair of hearing protectors over

her ears. She had started wearing them a while back,

when people had begun to suspect that the roar of air

in your suit might be loud enough to damage your

hearing. They hauled on their space suits and sealed

the Ziploc zippers. They edged around each other as

they fiddled with their suits. People wearing biohazard

space suits tend to step around one another like two

wrestlers at the beginning of a match, watching the

other person's every move, especially watching the

hands to make sure they don't hold a sharp object. This

cringing becomes instinctive.

Which best states the central idea of this excerpt?

O It is always necessary to work with a partner when

dealing with unidentified substances.

○ Extreme precautions must be taken when dealing

with potentially hazardous materials.

O Scientists are well known for being overly cautious

and for taking unnecessary safety measures.

O It is standard procedure to wear both space suits

andaring protectors in laboratories.