Question

food safety
many people often ask, \how do i know if foods in the freezer are safe?\ every year, thousands of callers to the us department of agriculture (usda) meat and poultry hotline aren’t sure about the safety of items stored in their own home freezers. the confusion seems to be based on the fact that few people understand how freezing protects food. that’s why it is important to educate oneself on how to freeze food safely. the more knowledge people have about their foods, the more they can protect themselves from illnesses caused by spoiled food.
one thing to remember is that food stored constantly at 0 degrees fahrenheit will always be safe. only the quality suffers with lengthy freezer storage. freezing keeps food safe by slowing the movement of molecules, causing microbes to enter a dormant stage. freezing preserves food for extended periods. it prevents the growth of microorganisms that cause both food spoilage and foodborne illness.
1
select the correct answer from each drop-down menu.
how does the underlined sentence shape and refine the central idea of the passage?
this detail explains how ​how freezing food ​food can ​drop - down options: keep food safe for longer periods, protect people from poor quality food, occasionally result in illness
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Explanation:

The underlined sentence (about freezing preventing microorganism growth) explains how freezing food keeps it safe for longer. The other options: "protect from poor quality" is wrong (freezing affects quality but not safety here), "occasionally result in illness" is opposite of what's said. So the correct option is "keep food safe for longer periods".

Answer:

keep food safe for longer periods